Mort-Hog
If moral relativism is wrong, I don't wanna be right.
Posts: 4,192
Incest was very popular in ancient Egypt. It mostly produces stillbirths, so it isn't really very...efficient. I never actually understood why incest has such effects (I wasn't very good at biology), but I imagine it is something to do with the two sets of genes being too similar and the child lacking some gene? I'd be interested if anyone knows specifically what happens. But anyway, yes, incest is unnatural, because of *answer to above question*, but homosexuality isn't quite the same..
Homosexuality is very useful for controlling population size, and it is very frequent in large insect groups. That way, the insect will still contribute to the community but not reproduce.
Sounds simple? Well, it isn't. Because the homosexual doesn't reproduce, there clearly can't be a single 'homosexual gene' (as that gene wouldn't be spread), but I believe the going theory is that homosexuality is caused by a combination of certain genes. As population size grows, the probability of achieving this combination increases. More and more of the population will become homosexual and it will slow down the population growth rate. I don't think it is likely that the population size will decrease due to homosexuals, but it will slow down a population boom.
This is observed in insects and other creatures where population sizes fluctuate quickly, but I'm not sure if it's been observed in mammals. There have been homosexual goats and deers and dogs observed, which is odd, as they don't have especially large population growth rates, so perhaps there's some other factor at play too.
Whether this has any effect in humans is considerably more complicated. Many creatures have, to some degree or other, the ability to learn and adapt and not just be reliant on genetically-determined stimuli like robots. But humans are swung way to that side of the spectrum, and pretty much all of your behavior is based on adaption. So it is very hard to tell whether homosexuality in humans is caused by genetics or social influences.
But homosexuality is far from pointless.
"The trouble with the world is that the stupid are cocksure and the intelligent are full of doubt. " - Bertrand Russell
The Triumph of Stupidity in Mortals and Others 1931-1935