Genetic cleansing

Sounds like an old story made new once again. Genetic cleansing - this time not for Jews - for homosexuality. A religious leader, Rev. R. Albert Mohler, is calling for people to change the sexual orientation of their child within the womb. It really does seem a stretch to call a predisposition a sin. And to try to change it in the womb? Hmm. If I remember by biology and zoology correctly - it's been awhile - the species which are more monogamous have smaller testes in the male, perhaps we could help out with the sin of adultery by shrinking the testes of males in the womb?