One hundred sixty-six gay men responded to a questionnaire survey which asked them to describe their social networks and the extent to which they 'passed' (were assumed to be heterosexual) among network members. Most gay men were known as gay to most members of their networks; however, friends, siblings and persons close to respondents were more likely to be aware of their homosexuality than co-workers, parents, and more distant relatives. Gay men were more satisfied with social support available from those who knew of their sexual orientation. The author concludes that passing has important and complex effects on the social networks of gay men.