Introduction - John C Gonsiorek and James D Weinrich The Definition and Scope of Sexual Orientation - John C Gonsiorek and James D Weinrich Homosexuality, Nature, and Biology - John A W Kirsch and James D Weinrich Is Homosexuality Natural? Does it Matter? Masculinity and Femininity in Homosexuality - Richard C Pillard `Inversion' Revisited Strange Customs, Familiar Lives - James D Weinrich and Walter L Williams Homosexualities in Other Cultures Stigma, Prejudice, and Violence Against Lesbians and Gay Men - Gregory M Herek Sexual Orientation and the Law - Rhonda R Rivera Psychological and Medical Treatments of Homosexuality - Charles Silverstein The Empirical Basis for the Demise of the Illness Model of Homosexuality - John C Gonsiorek Constructionism and Morality in Therapy for Homosexuality - Gerald C Davison Sexual Orientation Conversion Therapy for Gay Men and Lesbians - Douglas C Haldeman A Scientific Examination Homosexual Identity - John C Gonsiorek and James R Rudolph Coming Out and Other Developmental Events Lesbian and Gay Relationships - Letitia Anne Peplau Lesbian Mothers and Gay Fathers - G Dorsey Green and Frederick W Bozett Partner Notification as an Instrument for HIV Control - Edmund F Dejowski et al AIDS Prevention and Public Policy - John C Gonsiorek and Michael Shernoff Conclusions - John C Gonsiorek