Tw pairs which at least one tw is homosexual were soliced through announcements the gay prs and personal referrals om 1980 to the prent. An 18-page qutnnaire on the "sexualy of tws" was filled out by one or both tws. Thirty-eight pairs of monozygotic tws (34 male pairs …
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NO ‘GAY GENE’: MASSIVE STUDY HOM ON GEIC BASIS OF HUMAN SEXUALY
N help expla why someone is gay or straight, relig or not, bray or not, and even whether they're likely to velop gum disease, one psychologist broad-rangg geic effects first me to light a landmark study — Mnota Tw Fay Study — nducted om 1979 to 1999, which followed intil and aternal tws who were separated at an early age.