Here's what McDumbass said, "How does homosexuality fit into a scientific worldview? It seems to fly in the face of Darwinism."
First off, no, it's not a slap in the face of Darwinism nor does it even go against the theory of evolution by natural selection, not in the slightest like many theists wish to claim. Not saying the theists are telling lies, I'm just saying that the theists are outright fucking wrong. They're wrong morally and the wrong scientifically and they're wrong statistically. Outright, Christians are just wrong, wrong, wrong. Anywhere they can get something wrong, they get it wrong.
First off, let's go into Richard Dawkins, someone who specializes in genetics.
So is it a slap in the face? No, not by any measures in reality does homosexuality go against scientific principles. It doesn't go against evolution nor science in general. Something more curious? Those that tend to have the "Gay gene", meaning people with gay relatives and the homosexual population themselves, tend to be far more fertile than those who don't have family that exhibit homosexual behavior and tendencies. The same is true within the animal kingdom and let's be honest here, there's definitely no shortage of sperm, not by a long shot. A guy can jack off 10 times a day, every day for a year and the last day, jack off 15 times and then finally have sex with a woman and get her pregnant. There is NO shortage of sperm.
So where does homosexuality come into play in history? Remember hearing about harems of women? If you were straight, you'd have your junk chopped off and have to use the feather in your hat to pee to prevent you from having sex with the women. The gays, however, did not get their junk chopped off since the gays didn't have interest in having sex with the women, they can protect the harem women and not defile them sexually, they're more interested in the guy having sex with the woman than they are the women.
Additionally gay men in families are often used today in various places in the world to act as support for the females of households because of the males having better upper body strength.
Gays within the family in small tribal villages of humanity were vital as the gay males often stayed home with pregnant female family members to help aid them, take care of them, defend them and take care of the pregnant females homely chores while the straight males went out and hunted and did all the manly shit they did.
So does homosexuality in humans benefit mankind any? Yes, it actually does. Homosexuality has benefited mankind throughout history and still benefits mankind to this very day. Additionally, the males being more fertile that donate to sperm banks for couples that are having trouble getting pregnant? Yeah, you're welcome for that too.
Studies have also shown that in cases of twins in which one of the twins is gay, the other twin is also more likely to also be gay as well showing a link in the relationship to genetics playing a part. In the cases of twins in which only one of them turn out gay (keep in mind I'm referring to identical twins) and the other being straight, the straight twin ends up having a much higher statistical chance of having sexual partners. The presence of the gay gene, even if dormant in a heterosexual male, far outweighs the benefits of homosexuality on a reproductive scale than the lack of benefits on the nonreproductive effects of the gay gene.
So in short? Homosexuality has been a great thing throughout all of mankind's history and is very likely the reason there's so many of us around.