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One hundred and sixty undergraduates (80 males, 80 females) participated in a field experiment designed to examine the influence of invasions of personal space and sex of requester upon subsequent helping. On the basis of previous research, it was predicted that helping would be markedly inhibited by invasions of personal space, and that the magnitude of these effects would be mediated by the sex of the individuals who perpetrated such intrusions. Surprisingly, however, results indicated that subsequent helping was actually facilitated by such invasions. A follow-up investigation replicated these results and suggested that they stemmed from a tendency on the part of subjects to perceive close physical approach by the requester as indicative of a high need for assistance.