Please define the term "natural." Or, perhaps you could leave that to the dictionary.
well, without us normal and more natural hetero's having sex, gay people wouldn't exist.
First of all, natural=/=efficient.
If it were, many organized religions could easily be considered unnatural, as they hold humanity back just as much as homosexuals.
That is, just as much as homosexuals would have, if there were as many of them as there are fundamentalists, and if they were incapable of reproducing regardless of sexual preferences. A homosexual male can still impregnate a homosexual female out of mutual respect and/or benefit. This, by the way, happens a lot, whether through [far less emotionally gratifying] intercourse or artificial insemination.
However, while homosexuals can reproduce heterosexually, it doesn't make it a good idea. My argument here is that a loving homosexual relationship is more efficient than a depressing, dishonest heterosexual one. A loving relationship produces more efficient members of society, namely because they're just plain happier. And before the argument is raised, the idea that there are more cases of abuse in homosexual relationships seems absolutely absurd to me. This is not only because there are many more studies claiming otherwise - but also because I know plenty of homosexuals, and they divide into better and worse people as evenly as heterosexuals do.
Secondly - what "natural" is (rather than isn't) has already been defined here, but I'll give it a try anyway.
Natural is what is produced by nature, ie things that occur. ALL things are "natural". Even the Christian version of Satan can easily be considered natural, as he was created by God, which is a natural aspect of God's power.
So I don't think "unnatural homosexuality" is what you're aiming for. I think you want to show that homosexuality is bad. And now all you really have standing for you are cultural standards, namely "the Bible says its bad". However, try telling me that *all* cultures despise homosexuals, and I'll show you this and this, for starters. Remember, when you reach the Greeks, that I'm not claiming its a good idea for an adult to have relations with an adolescent boy - I'm showing that even ancient, non-"liberal" cultures accepted homosexuality, despite claims to the contrary.
Now, if you REALLY wanna play hardball on the "natural" part, I can argue in favor of the existence of necrophilia in the animal kingdom - gruesome and natural as it comes. But its still natural.
