The current study was undertaken to develop a typology of “secret tests,”—that is, social strategies that people use to acquire knowledge about the state of their opposite-sex relationships. Furthermore, the influences of relationship type and respondent sex on strategy use were assessed. Both qualitative and quantitative methods were employed with data obtained from a total of 181 respondents. Findings suggest 14 basic categories of “secret tests” that comprise 7 cluster types in a two-dimensional spatial representation. Passive, active, and interactive strategy types were evident. Females reported more secret test strategies than did males, and people in opposite-sex relationships that were in transition from platonic to romantic reported more strategies than people in either platonic cross-sex or romantic cross-sex relationships. Differences were found as well in the type of secret test most likely to be employed as a function of respondent sex and relationship type.