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- Methods and data
Objective : Estimate the prevalence of sexual behaviour and alcohol use and examine the association between excessive alcohol use and risky sexual behaviour in late secondary students in Victoria, Australia.
Method: The sample of Year 11 students from government and independent schools participating in the 2008 International Youth Development Study (n=450) was representative of the Victorian school population. Logistic regression analyses examined the associations between sexual behaviour, binge and compulsive drinking, adjusting for socio-demographic, school and family factors.
Results: Under half (44%) the students had experienced sex in the past year, half (50%) had engaged in binge drinking in the past two weeks and 26% reported compulsive drinking in the past year. Of those who reported sex in the past year (n=197), 34% had sex without a condom at the last sexual encounter and 28% later regretted sex due to alcohol. The likelihood of experiencing sex was increased by binge (OR=2.44, 95%CI 1.44–4.12) and compulsive drinking (OR=2.15, 95%CI 1.29–3.60). For those sexually active, binge drinking increased the risk of having three or more sexual partners (OR=3.37, 95%CI 1.11–10.26) and compulsive drinking increased the likelihood of regretted sex due to alcohol (OR=4.43, 95%CI 2.10–9.31). Excessive drinking was not associated with condom non-use.
Conclusion and implications: Risky sex – multiple sexual partners and regretted sex due to alcohol – and excessive drinking are highly prevalent and co-associated among Victorian late secondary students.
Unsafe sex refers to behaviours that increase the risk of sexually transmitted infections (STIs) and unwanted pregnancy. Unsafe sex and the adverse health outcomes that can result are important areas of public health research. The prevalence of unsafe sex is particularly concerning among adolescent and young adult populations given that they typically demonstrate low levels of sexual health knowledge and high rates of short-term or casual sexual partnerships.1 Excessive alcohol use has been positively associated with being sexually active and with risky sexual practice.2–7 Given the increases in prevalence of these behaviours in Australia over the past decade,8–10 this association offers an important focus for empirical research.
In Australia, the Secondary Students and Sexual Health (SSASH) study reports nationally representative data on the sexual behaviour of young people aged 15 and 17 years over time, using a repeated cross-sectional methodology. In 1997, 34% of students reported experiencing sex in their lifetime and this figure had increased to 40% in the 2008 study.8 Similarly, the rate of young people having sex with multiple partners had increased significantly in Australia, with the proportion of those reporting sex with three or more people in the previous year rising from 16% in 1997 to 30% in 2008. The study also found that although the majority of students (64%) reported using a condom when they had sex the last time, this rate had not increased since 1997.
Rates of harmful alcohol use by young people have also increased in Australia. A nationally representative study of secondary students in Australia found that between 1999 and 2008 the proportion of young people aged 12 to 17 years drinking harmful levels of alcohol increased from 26% to 29%.10 In a cross-national study of young people's (Grades 5, 7 & 9) alcohol use and related harms conducted in Victoria, Australia, and Washington State, United States (US), Toumbourou et al. found the rates of alcohol use and related harms for the Victorian sample of the study were noticeably higher than those for young people in Washington State.11
Although situational factors such as excessive drinking are clearly important in terms of understanding adolescent sexual practice, other factors, such as the formation of normative behaviour through socialisation, may also play a role. Family and school are important socialisation sites. Family factors have been shown to influence a range of adolescent behaviour including risky sexual practices, with cohesive and supportive family environments found to be protective.12–18 Risky adolescent sexual practice is also associated with experiences in school and education with studies demonstrating that educational attainment18–20 and connectedness to school18,21,22 are protective.
This paper responds to the need for current Australian information by analysing data relating to young people's sexual behaviour and its association with alcohol – specifically binge (five or more drinks) and compulsive drinking (unable to stop). In this paper we define risky sex as sex with multiple partners in the past year, sex without using a condom at the most recent sexual encounter and sex in the past year that the young person later regretted due to alcohol use. We also examine the association between drinking behaviour and young people's exposure to sexual intercourse in the past year. Given the high prevalence of alcohol use demonstrated among Australian youth, we chose to model two measures of excessive episodic drinking to test the comparative effects these different drinking behaviours may have on sexual risk taking. Moreover, we seek to explore the relationship between young people's sexual behaviour and drinking, taking into account possible confounders such as school and family factors. More specifically, we hypothesise that young people who engage in excessive drinking (binge or compulsive drinking) will be at greater risk of engaging in risky sex, independent of their level of connectedness to and performance at school, and the quality of their family environment.
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- Methods and data
Overall, 790 students were surveyed in wave 6 of the IYDS study – 85% of the original 927 students participating in 2002. Of these students, 508 government and independent school students answered the question regarding sexual experience in the past year with 58 cases (11%) excluded from analyses due to listwise missing data across measures. Analysis of these cases showed no differences between excluded cases and those providing complete data on the sexual behaviour outcomes. The demographic profile of the final sample included in the analyses (n=450) is shown in Table 1.
Table 1. Sample demographic characteristics n (%).a
|Gender Male Female|| 198 (44) 252 (56)|
|Age, mean (95%CI)||17.0 (16.9,17.0)|
| Family SES factors || |
|Mothers educationb Below secondary Completed secondary Post secondary|| 164 (37.1) 146 (33.0) 132 (29.9)|
|Fathers educationb Below secondary Completed secondary Post secondary|| 107 (29.0) 160 (43.5) 101 (27.5)|
|Family incomeb < $50,000 $50,000 –$100, 000 > $100,000|| 164 (45.3) 149 (41.2) 49 (13.5)|
|School area Urban Regional Rural|| 233 (51.8) 56 (12.4) 161 (35.8)|
|School sector Government Independent|| 339 (75.3) 111 (24.7)|
Table 2 shows prevalence estimates for sexual behaviour outcomes and drinking behaviour. Under half the sample (44%, n=197) reported that they had experienced sex in the year prior to being surveyed and although young women reported higher rates of sex in the sample than young men, this difference was not statistically significant (F(1,150)=3.56, p=0.06). Although most sexually active students (58%) had sex with only one person in the year prior to being surveyed, considerable proportions reported either two (23%) or three or more (19%) sexual partners. At their last sexual encounter, one-third reported not using a condom, with young women more likely than young men to report not using a condom the last time they had sex (F(1,96)=5.86, p=0.02). Under one-third of sexually active students reported having sex that they later regretted due to alcohol in the past year. Although male students reported regretted sex due to alcohol more commonly than young women, this difference was not statistically significant (F(1,93)= 0.87, p=0.35). Finally, approximately 5% (n=10) of sexually active students in the study sample reported having sex that resulted in a pregnancy.
Table 2. Student sexual and drinking behaviour by gender: rates (%) and 95% confidence intervals (95%CI).
|Variable||Males % (95%CI)||Females % (95%CI)||Total % (95%CI)|
| Sexual behaviour || || || |
|Sex in the past 12 months (n=450)||38.4 (31.8–45.4)||48.0 (40.4–55.7)||43.8 (38.5–49.2)|
|Three or more sexual partners in the past 12 months (n=195)||18.9 (11.4–29.8)||19.0 (12.6–27.6)||19.0 (13.7–25.6)|
|Had sex they later regretted due to alcohol in the past 12 months (n=194)||32.0 (23.2–42.3)||26.1 (19.3–34.2)||28.4 (23.1–34.2)|
|Did not use a condom at the last sexual encounter (n=197)||23.4 (15.0–34.6)||40.0 (31.6–49.0)||33.5* (27.0–40.7)|
|Sex that resulted in a pregnancy in the past 12 months (n=196)||5.3 (2.0–13.5)||5.0 (2.2–10.7)||5.1 (2.6–9.7)|
| Drinking || || || |
|Binge drinking in past 2 weeks (5 or more drinks)||54.5 (45.9–62.9)||46.0 (38.7–53.5)||49.7 (43.5–56.0)|
|Compulsive drinking in past year||21.7 (16.4–28.2)||29.0 (23.5–35.2)||25.8 (21.9–30.1)|
Approximately half the students reported drinking five or more alcoholic drinks in a row in the two weeks prior to being surveyed and just over a quarter said they had experienced an episode of compulsive drinking in the past year. Young men showed higher rates of binge drinking than young women (F(1,150)=2.8, p=0.10) but compulsive drinking was more prevalent among young women (F(1,150)=2.9, p=0.09). These differences were not statistically significant.
Students’ use of alcohol was associated with higher rates of sexual behaviour. For the bivariate associations, students who reported binge drinking in the past two weeks and compulsive drinking in the past year were more likely to have, in the past year, experienced sex (binge drinking: 59% vs. 29%, F(1,150)=29.4, p< 0.001; compulsive drinking: 65% vs. 37%, F(1,150)=24.4, p<0.001), had three or more sexual partners (binge drinking: 24% vs. 9%, F(1,94)=4.1, p=0.05; compulsive drinking: 27% vs. 14%, F(1,94)=6.4, p=0.02) and experienced an episode of sex they later regretted due to alcohol (binge drinking: 33% vs. 18%, F(1,93)=3.18, p=0.08; compulsive drinking: 47% vs. 17%, F(1,93)=20.9, p<0.001). There were no statistically significant associations between alcohol consumption and condom non-use at the last sexual encounter (binge drinking: 32% vs. 37%, F(1,96)=0.56, p=0.45; compulsive drinking 34% vs. 33%, F(1,96)=0.03, p=0.87) and unintended pregnancy (binge drinking: 6% vs. 3%, F(1,95)=0.79, p=0.38; compulsive drinking 8% vs. 3%, F(1,95)=1.7, p=0.19).
When models were adjusted for sociodemographic, school and family bonding factors, we found that the associations between excessive alcohol consumption and experience of sex and – for those who were sexually active – three or more sexual partners in the past year and regretted sex due to alcohol consumption were maintained (Table 3).
Compared to students who had not drunk excessive amounts of alcohol in the past year, those who engaged in a binge drinking episode (OR = 2.44, p<0.01) or reported an episode of compulsive drinking (OR=2.15, p< .01) were more likely to have experienced sex in the previous 12 months. Students who considered their parents to espouse either moderate (OR=1.86, p=0.03) or favourable (OR=2.38, p=0.01) attitudes towards their children's drug and alcohol use were more likely to have experienced sex in the past year compared to those who thought their parents held unfavourable attitudes to their drug and alcohol use.
Sexually active students who reported at least one binge drinking episode in the previous two weeks were more than three times more likely to have had three or more sexual partners in the past 12 months (OR=3.37, p=0.03). Furthermore, compared to students with high self-rated academic performance, those with medium self-rated academic performance levels were more likely to report three or more sexual partners in the past year (OR=3.22, p=0.02).
Unsurprisingly, students who drank large amounts of alcohol were more likely to report having sex that they later regretted due to alcohol. Those who reported at least one episode of compulsive drinking in the past year were more than four times as likely to have sex they later regretted due to alcohol, than students who had not drunk compulsively (OR=4.43, p< 0.01). Students who reported a binge drinking episode in the past two weeks also reported higher rates of regretted sex due to alcohol than those who did not binge drink, however the differences here were not statistically significant (OR=2.23, p=0.10). Students who reported low family attachment were less likely than students with high levels of attachment to have sex they regretted due to alcohol (OR=0.35, p=0.04).
Despite the positive association between excessive drinking and risky sexual behaviour, condom use remained relatively stable across heavy and non-heavy drinking student populations. As Table 3 shows, on both binge drinking and compulsive drinking measures, students who drank excessively had comparable rates of condom non-use at the last sexual encounter to those who did not drink to excess (binge drinking, OR=0.99, p=0.99; compulsive drinking: OR=0.80, p=0.56) Students whose parents held favourable attitudes towards their children's drug and alcohol use were less likely to report not using a condom at the last sexual encounter compared to those with parents who held unfavourable attitudes (OR=0.29, p=0.04). Compared to students with high levels of family attachment, students with only moderate attachment were more likely not to use a condom when they last had sex (OR=3.17, p=0.03).
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- Methods and data
In line with the hypotheses, the study found excessive alcohol use continued to show statistically significant associations with sexual behaviour and indicators of risky sex, after controlling for demographic, school and family factors. The results reveal that of Victorian Year 11 students, under half had experienced sex in the past year. The study also showed that in Victoria, significant numbers of students consumed excessive amounts of alcohol and at times lost control of the ability to stop drinking.
Significant minorities of sexually active young people engaged in risky sexual behaviour. Of those who were sexually active, approximately one in five students reported sex with three or more people in the past 12 months and one-third did not use a condom when they last had sex. One in 20 students reported sex that resulted in pregnancy, although as both young men and young women were asked about pregnancy this figure may overestimate pregnancy rates. Not surprisingly, given the rates of sexual behaviour and excessive drinking, over one-third of students had engaged in sex which they later regretted because of alcohol use. This finding is concerning as a regretted sexual encounter may indicate circumstances where the level of perceived control of the sexual experience may have been compromised or diminished. For example, regretted sex may indicate a sexual encounter contextualised by sexual coercion, poor communication about expectations of the encounter or sexual inexperience and unpreparedness for sex. These are not only poor outcomes intrinsically (from mental and, potentially, physical health perspectives), but may also have longer term sexual health implications for the young person as they form subsequent sexual partnerships.
The high rates of risky sexual behaviour and excessive drinking of young Australians reported in this research are comparable to those reported by other studies collecting similar data. This increases confidence in the methodological robustness of the present study by establishing the validity of estimates from this analysis across different studies from similar populations. The rate of sexual experience reported by students in this study (44%) is lower than the 56% (This figure is for Year 12 students but with a similar mean age to that of the sample used in this analysis) reported by Smith et al.9 but the difference might be partially explained by the SSASH study asking students about lifetime sexual experience rather than the past year only. The rates of condom use at the last sexual encounter were similar across the two studies (66% vs. 61%), however, the estimate of the rate of multiple sex partners over a year (using three or more sexual partners as a comparison) was lower in the current study (19%) than the 30% reported in the SSASH study. In terms of student binge drinking, the rate reported in our research (50%) was slightly higher than the figure reported in the Australian Secondary Students Alcohol and Drug (ASSAD) survey (45%), although the higher number of alcoholic drinks used to define a binge drinking episode in the ASSAD study (7+ drinks for young men, 5+ drinks for young women) will likely account for this lower estimate.
We found that excessive alcohol use was associated with a range of risky sexual behaviours, independent of school and family bonding factors. This finding is important as it suggests that the adverse effects of excessive alcohol consumption on youth sexual health behaviour are not explained by confounding due to common factors relating to school and family environments.
Although binge drinking and compulsive drinking increased the likelihood that students would be sexually active, these drinking behaviours were not associated with condom use at the last sexual encounter for sexually active young people. In some respects, this is an encouraging finding as it suggests that condom use behaviour of sexually active adolescents is to some degree impervious to excessive alcohol use. This may be because using a condom during sex has been reinforced in targeted public health campaigns to the extent that it has become accepted practice, even among adolescents drinking excessively. Nonetheless, as the present study and other research has found, a sizable proportion of young people do not use condoms consistently despite increases in rates of STIs over the past decade in Australia.
There are several limitations that may have affected the findings of this research. First, given the cross-sectional design of this study it is not possible to infer causal directions. The temporal nature of the association between excessive alcohol use and sexual behaviour is difficult to establish, although there is limited theoretical ground to argue that early sexual behaviour leads to excessive alcohol use and the current findings suggest the association is not explained by confounders. Second, the missing data from Catholic schools and the small numbers of cases included in some analyses, particularly those relating to the sexually active group of students, should be taken into consideration when interpreting the external validity of results from this study. Comparison with the included sample suggested relatively minor differences and the estimates of sexual behaviour and alcohol use were similar to other surveys.
In conclusion, the findings of this study suggest that for young people, drinking excessive amounts of alcohol increases the odds of engaging in sexual practices that may carry potential health risks for the individual. Encouragingly, among those who were sexually active, students’ use of condoms to prevent both transmission of STIs and unplanned pregnancy did not appear adversely affected by excessive alcohol use. Nonetheless, given the increases in sexual behaviour and prevalence of STIs in Australia and the static rates of condom use in younger populations, the high numbers of young people who continue to engage in unprotected sex is concerning from a public health perspective. Given our findings we recommend that future research investigate the effect on youth sexual behaviour of interventions that reduce rates of binge or compulsive drinking.