True, I look at it more biologically, especially seeing how folks like to talk about the so called "naturalness" of homosexuality.
It's in our best interest (and natrual interest) for humans to survive and this can only be done if we procreate. By way of experiment, if all hetero people lived on Earth, lesbians on Mars, and gay men on Venus, it is pretty clear cut who'd be alive by the time I'm 80, and who'd potentially wipe out the human race.
We can't work around the unnaturalness of homosexuality, period. If we could find away to reproduce without the need of the opposite sex, then one could argue that it's as natrual as liking chocolate ice cream, etc.