A tendency to alcoholism is also in the genes (I know, I inherited it). Genetics are not destiny; one can choose whether to drink to excess (something I have chosen, occasionally with great difficulty, never to do).
A tendency to adultery is in the genes for many people. Again, one can choose how to respond to that desire.
As for a tendency to homosexuality, one can choose whether to act on those urges. My neighbor is a nice man with five kids and is absolutely devoted to his wife. His identical twin brother was gay and died of AIDS several years ago. Same genes, different choices.
Excellent commentary.