@oaktonarcher,
Choice.
Perhaps it is conditioned.
If it is a DNA matter, then there is no explanation for the higher number of children raised by homosexual parents to be gay. The kid's biological parents are straight in most cases. Excluding a sperm donor for a lesbian couple, or a sperm donation by a gay male couple, the kid's biological parents are not gay, so the kid should not be gay, right? Well, there is a higher percentage of homosexuality in children reared by homosexual couples, so I'm inclined to believe NO. it is not the DNA.