Archives of Sexual Behavior. Twin pairs in which at least one twin is homosexual were solicited through announcements in the gay press and personal referrals from to the present. Thirty-eight pairs of monozygotic twins 34 male pairs and 4 female pairs were found to have a concordance rate of Twenty-three pairs of dizygotic twins were found to have a concordance rate of In addition, three sets of triplets were obtained.
Exclusive AL4A. About Share. Les mormon teen climaxes riding face. Evelin is stuffing Zoeys cunt full with her strap on.
You must be logged in to post wall comments. Please login or signup free. Register Login Upload. Videos Members.
The first large study of female sexual orientation has found a strong genetic component to homosexuality, researchers at Boston University and Northwestern University report today. Previous studies of male homosexuals have obtained the same result, but those studies have been highly criticized because the groups examined did not include women. Some scientists have questioned whether genetics would play as strong a role in female homosexuality because the biological mechanisms proposed seemed to be unique to males. But the fact that not all the identical twins were gay indicates that environment also plays a role, said Northwestern psychologist J. Michael Bailey.