You poor child. Were you abused by someone of the opposite sex in your life? Besides, I wasn't smiling. That was a Smiley on my post.
Actually...
...irrelevant.
If that's the track you want to take, you're the one taking it, not me. There are many tracks off my train of thought. However, consider. Homosexuality doesn't produce offspring. Only heterosexuality does. All the rest of the stuff (except some of the health advantages that are found in heterosexuality only) can be found in deep friendship, even if it seems to be going in the direction of "sex," but doesn't quite get there.
So what if it produces offspring? There's nothing logical about saying that having offspring is automatically good. For the sake of your image, I wouldn't be arrogant while asserting a non-sequitur.
Homosexuality is unnatural. Even the few heterosexual animals that partake of homosexuality show that they are flawed psychologically. Now, there isn't anything wrong with having flaws. Flaws are inherent in all of us as things stand. The thing that makes flaws into perversion is when people LIKE their flaws rather than trying to find ways out of them.
Which is it? Unnatural or natural? You recognized that animals have displayed homosexual tendencies (*hilarious* that you call them heterosexual and talk about their psychology, as if you interviewed them for Cosmopolitan or something).
If that wasn't enough, you then try to equate "unnatural" to "flawed." Um, no, you can't do that.
I'll give you another shot to demonstrate that what you said makes sense (hint: it doesn't). Construct a deductive argument in the form of a series of premises that prove your conclusion(s), "Therefore, homosexuality is unnatural and bad." If you can't, then I'll assume you have no idea what you're talking about (I'm being facetious, here; I already know you won't be able to, but I want you to see that you can't for yourself).
The comforting friendship between sexual partners of the opposite sex, when a child is not produced, are there to strengthen the relationship. The stronger relationship will beneficially affect future children, present children, adult children whose parents become more strongly bonded. But there isn't ever going to be any child produced by homosexual relations. So, why not simply be good friends, and avoid the perversion of being gay?
This is so full of stupid I am actively hoping bad things happen to you right now. You're a danger to humanity and you should be removed from this society, and if it were in my power to do so, I would.