In another thread, Dan made the claim that homosexuality was "natural". He also claimed that homosexuality was "normal", but I'll leave that alone for now.
Why would he make the argument that homosexuality is "natural"? Given the context, I think it's safe to conclude that he is (at a minimum) implying that because homosexuality is "natural", that it cannot be a bad or negative thing. I suspect, that he's really saying that homosexuality is good because it's "natural".
Let's start with some data. Apparently 450 species engage in some sort of same sex activity, which might seem like a lot, until you realize that there are over 7,700,000 species on earth. .00006% of all species engage in some form of same sex coupling. But, indisputably, those species don't exclusively engage in same sex coupling, so the .00006% actually overstates the number of species for which this is "natural".
Also, let's consider evolution. Again Indisputably, one major factor of believing in Darwinian theory (or it's offshoots), is that one of the key factors in evolution is reproduction. In other words homosexuals are an evolutionary dead end. But, Scientific American to the rescue. They posit the following.
"In our hypothesis, the ancestral animal species mated indiscriminately with regard to sex, i.e., they mated with individuals of all sexes, if only because it is unlikely that the other traits required to recognize a compatible mate—differences in size, shape, color or odor, for example—evolved at exactly the same time as sexual behaviors."
Leaving aside the obvious conclusion that their hypothesis is impossible have the scientific method applied to it, let's look at the implications for Dan's claim that homosexuality is "natural".
What SA is saying is that it is or was natural for animals to engage in sexual behavior with any and every beast that crossed their path because this promiscuity would mean that at least some of the other beasts would reproduce. While that's a creative way to dodge the challenge to homosexuality on evolutionary grounds, it really doesn't help Dan to suggest that homosexuals should be indiscriminately humping anything that they see.
In many cases, one animal will engage in same sex behavior with another animal as a way to assert dominance, in other words, rape. One hopes that this "natural' behavior isn't what's being advocated for.
I guess I'm having trouble making the lead from non sentient animals who engage in sex indiscriminately or as a way to assert dominance as models for human behavior.
Now, a slightly different tack.
When there were discussions about how scripture treats homosexuality we were given two main arguments for why scripture didn't apply to the homosexuality we have now.
1. The "There are only a few texts that ever somewhat reference something that sounds like it could be homosexuality." argument. Let's call it the Scarcity argument. If we accept the argument that scarcity in scripture is an argument against homosexuality being seen negatively, then why wouldn't we treat scarcity in nature in the same way? Why would we assume that something that happens in .00006 species of animals, was in any way a behavior that is to be encouraged.
2. The "Loving Relationships" argument. This one said that since the scriptural references were really only about prostitutes of some sort or another, that they didn't apply to the loving, monogamous, relationships that predominate today. leaving aside the issue of whether "loving/monogamous/committed" relationships are even the majority of homosexual unions, there is statistically almost zero evidence to demonstrate conclusively that homosexuality is animals is in the context of a "loving/monogamous" relationship.
So, while homosexual sex acts may be "natural" in some broad sense, I'm not sure that actual animal gay sex is a great example to follow.
In conclusion, nature. It's been famously said that "Nature is red in tooth and claw", in nature we see survival of the fittest, parents who eat their young, females who kill or eat their mates, and the like. Nature is literally a "dog eats dog" world, the whole "circle of life" thing.
So, given what we actually see in nature, why do we selectively choose homosexuality is the one single thing to use as an example to follow, and that it being "natural" is a positive argument in favor of homosexuality.
Ultimately I guess it depends of what "homosexuality is natural" is supposed to mean or to prove.
What really makes me wonder is why anyone who insists that all of nature came into existence as a coincidence, that there is no meaning or purpose to anything, that there is absolutely nothing beyond our finite existence, and "selfish genes" are acting purely in their own self interest, would think that we shoudl take our behavioral cues from animals.
Well, if my dog can hump everything, it's natural and it doesn't hurt anyone, I think I'll start humping the legs of everyone I meet.