Gay, Straight, and the Reason Why: The Science of Sexual Orientation

LeVay himself cites the best recent study, that of N. Langström,1 who found in a huge data set compiled from the national registry for twins in the nation of Sweden that of 71 monozygotic male twin pairs in which at least one co-twin was gay, in only 7 cases was the matching co-twin also gay. [...] LeVay should have reported that "if one such twin is gay, there is roughly a 1 in 10 chance that the co- twin will also be gay." [...] I was stunned by LeVay's treatment of early sexual experience of children and adolescents.