[GovernmentShrinker]

Re XX fetuses, the "cure" would be abstinence throughout pregnancy (presumably you can grasp what the primary source of in utero testosterone is). Not sure if any research backs up the notion that the opposite would work for XY fetuses. But at any rate, I'm skeptical that any significant percentage of pregnant couples would be willing to stick to such programs.

[punster]

"Re XX fetuses, the "cure" would be abstinence throughout pregnancy (presumably you can grasp what the primary source of in utero testosterone is)."

Actually, another source of androgens is the adrenal gland. Women do have some testosterone circulating in their blood stream, even if they are totally abstinent. Maternal stress may elevate the activity of the adrenal glands.

There may be conncection to the published paper that described how their were an unusually high number of male homosexuals born in Germany during the period of time surrounding the end of the Second World War. Some individuals have suggested that excess fetal exposure to androgenic compounds might contribute to male homosexuality.

Furthermore, the same mechanism might contribute to lesbianism.

Now, for the case of failure of the XY (male) brain to masculinize, some progesterones have an anti-androgenic effect. Those progesterones may sometimes act to block the action of testosterone on the brain. The other suggested explanation is the fetal testes turn off to soon, and fail to supply the testerone for masculinizing the brain.