I wonder how many women have homosexual children after they kick “Dear old Crazy Dad” to the curb and marry their boyfriend.
That's an excellent question. The biggest reason for male homosexuality is the breakdown in the family structure--fathers being physically and/or emotionally absent (who may have suffered the same fate from their own fathers, and so on). Hundreds of years ago, homosexuals were a rarity. Sadly, in our broken society, they're becoming more and more common.
Another thing to keep in mind is that there is no such thing as someone who is "gay" per se. They are simply split off from a valid but unaffirmed part of themselves. Their gender identity is there, lying dormant, but because they are separated from it, they cannot recognize it or accept it. In a nutshell, a male homosexual doesn't feel like a man, and a female homosexual doesn't feel like a woman. But this condition is neither genetic nor permanent. It is something that God can heal, if people know how to pray about it. It won't be healed overnight, of course. The process often lasts years. It's kind of like going to Weight Watchers. You don't walk in there 150 pounds overweight, and then walk out a few hours later a size two. ;) In general, I don't like to refer to someone as "gay," because it's over-identifying with their problem and under-identifying with the true, normal person God created IMO.
Of course, the breakdown in family doesn't just result in a homosexual vs. heterosexual problem. Because of the lack of effective fathers, many, many heterosexual men are insecure in their masculinity as well. Even though they are still sexually attracted to women, they may not feel as manly or masculine as other men, and will have emotional problems their whole lives. To compensate, they may work at the office 24/7, work out at the gym 15 hours a week, act "macho" to conceal their insecurities, have numerous affairs to prove their "manhood," etc. They have difficulties accepting themselves as men, suffer from low self-esteem, and never quite feel "good enough." But the good news is that God, who is so masculine that even men are feminine in relation to Him, can heal any emotional deficits that a person suffers from, even those that began in childhood or infancy.
And women are certainly affected by lack of fathering as well. They may suffer from low self-esteem, have difficulties relating to men, expect too much emotionally from their husbands or boyfriends, become controlling and domineering, etc. The list of problems caused by the breakdown of family can fill up volumes. :(
That's another reason that society's acceptance of the homosexual lifestyle is so dangerous--it just furthers the dissolution of the family structure that God created, causing more chaos.