Autogynephilic transsexuals are not "women in men's bodies" (Anne Lawrence, a physician and sex researcher who is herself a postoperative transsexual… - J. Michael Bailey

The contention that homosexual orientation (as distinct from homosexual behavior) is a recent and local phenomenon is not supported by the evidence. Men who look awfully similar to the men I’ve been talking about in previous chapters seem to have existed through the ages and in vastly different cultures. Social constructionists’ refusal or inability to see this suggests that they are trying to keep their eyes closed.

The current popular literature about transsexualism is noteworthy for its ignorance of the distinction between autogynephilic and homosexual transsexuals.

When most people hear “environment,” they automatically think of the social environment, such as how children are raised or what kind of interpersonal experiences they have. But to a geneticist “environment” means anything not encoded in DNA, and this includes biological factors as well as social factors: diet, germs, and random biological events might also affect development. For example, when one identical twin is born with a major brain defect such as anencephaly (lack of a cerebral cortex, or outer brain) or microcephaly (a very small cortex), the other twin is usually normal. Only environment can cause identical twins to differ, but the environmental problem in this case is biological.