Carmel
I have a question for Tetra and others that see evolution as the most likely explanation for life as we know it....How is homosexuality's continued existence explained? If it is genetically determined, how is the allel or group of allels selected for when the end result in such behavior does not result in succeeding generations? It would have to be a "linked" characteristic that was so strong that it was "carried" baggage, so to speak! Even at that, it would have to have a genotypic expression that is selected for by the bearing of offspring with that same genotype.Suggests that maybe it is not genetic...or ??
Great question and well put.
Current bets are on the genetic component for male homosexuality being on the X chromosome. This would mean a man would never, ever 'get' homosexuality from another man, as a man's X chromosome HAS to be from his mother. I can dig some stuff out for detail if you'd like, but am going out to a party after work and need to get out the office.
Thus if genetic transfer of sexual inclination is carried by the female, the male's sexuality cannot prevent further transmission. Think how a male haemophiliac can NEVER transfer his genetic condition to a male child, as it's on his X chromosome, but WILL transfer it to a female child - although she has another X chromosome so will probably have one working copy (females who develop hemophilia are very rare)
If the gene/s have a reproductive or other survival benefit for the mother, or for any female who carries them, then they will survive under the laws of natural selection. Whether a man also gets the same benefit or any benefit as a woman gets from the gene/s IN ADDITION to a homosexual inclination is still unknown.
The seeming illogicality of a gay man being gay because he got the gayness genetically is totally logical.
Of course, one cannot ignore that having kids and sexuality are not linked. Millions of men who would have been openly gay if they grew up in a society where this was possible got married and had kids. Millions of women who would have been openly gay if they grew up in a society where this was possible got married and had kids. Even now, gay couples (like one I know) prove sexuality and having kids are separate things by having kids without having sex with someone they are not sexually attracted to; just as a woman whose husband is infertile can have children by someone she is not sexually attracted to. There are species (terns, macaques) that form homosexual pair-bonds or single-sex groups that are sexually active, but they STILL have offspring.
I hope that's clear, I can give more details and references when I have more time if you so wish.