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. We scribe six pairs of monozygotic tws, which at least one member of five pairs were homosexual, and one of the remag pair was bisexual, om a seri of 55 pairs, reared apart om fancy; all the female pairs were disrdant for homosexual behavur. This and other evince suggt that female homosexualy may be an acquired tra.