THIS paper is one of a series on male and female homosexuality. We have already reported on the sexual behavior of the female homosexual1and on the clinical psychiatric aspects of the male homosexual.2Forthcoming reports will include the clinical psychiatric aspects of the female homosexual, the developmental history and parental home of male and female homosexuals, and the sociological aspects of homosexuality. In the present report, it is our intention to present some of the data on the sexual behavior of the male homosexual. We will also discuss some of the relevant comparisons between his behavior and that of the female homosexual. There have been several studies on male homosexuality.3-6However, there have been few systematic investigations involving samples of male homosexuals drawn from the community.4,5,7 Studies by psychiatrists have involved samples of male homosexuals who had been in