How will you explain to your children...

[max-greece]

Its actually not an insane question. There are a number of probable causes of homosexuality, one of which, for example, is not genetic.

It appears that in families which have 4 or more sons the probability that the last son will be homosexual is much higher than the norm for the general population. It is speculated that it might be caused by the mother producing something akin to anti-testosterone as a kind of immune system reaction.

Although I'd hate to accidentally defend Wooters for such a stupid question (and it is stupid because the answer is numerous and obvious), this theory does not hold up since it offers no explanation for the existence of lesbians. By that theory, it would seem that a mother should only produce a gay man or some kind of mega-slut woman or something.

I am not sure it is fair to expect the theory to explain lesbianism as the route cause may be entirely different. For reasons I do not know the amount of effort put in to explaining lesbianism is significantly less than that to explain homosexuality.

The preponderance of homosexuality amongst 4th sons means this is something of a proven case - but it is not the only cause. In that there appear to be multiple factors involved it is not unreasonable to expect that lesbianism has its own route causes. Some of these may turn out to be common with some of the causes of homosexuality whilst some may turn out to be unique.

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So if homosexuality is genetic, why hasn't it been breed out of existence by now?

Up until the XX century, people were almost forced into matrimony and had to have children, regardless of the existence of any attraction between the two parents.
Homosexual tendencies already present in ancient Greece, have thus, remained around, however hidden.

These past few decades have seen the homosexual individuals released from such bondage and become somewhat accepted. From now on, homosexuality should decline for the exact reason you expect it to have been bred out.
However, I doubt it will ever go through a complete wipeout, exactly for the same reason many other genetic disorders still pop up on a few individuals...

This is simply wrong. There is no evidence what so ever that homosexual parents (which does happen - a lot) sire homosexual children more often than the general population. The odds are stable - implying that sexual orientation is not passed on via the father.