This study examined the prevalence of unwanted sexual contacts among a sample of 310 homosexual men with an average age of 21.8 years recruited in Berlin, Germany. A modified version of the Sexual Experiences Survey was developed to record unwanted contacts involving different means of coercion, sexual acts, and victim-perpetrator relationships. Reports were elicited about (a) sexual victimization and (b) perpetration of sexually aggressive acts. Three methods of victimization were studied: physical force, exploitation of the victim's incapacitated state, and verbal coercion. Of the 310 respondents, about 15% reported sexual victimization through the use or threat of force. Twenty percent were victimized through exploitation of their inability to offer resistance when in an incapacitated stare. Ten percent reported victimization through verbal coercion. III terms of being the perpetrator of sexual aggression, over 5% of respondents reported using or threatening to nse physical force. Over 16% reported exploiting a person's incapacitated state, ann over 6% admitted to the use of verbal coercion. Acceptance of money for sex was identified ns a risk factor for both victimization and perpetration. The data show that sexual aggression is a serious problem among homosexual men which requires further exploration.