Reproduction is our most important goal, it's in our nature to reproduce with each other using the straight method. Homosexuals cannot achieve our most important goal without going straight. So the way I see it their sexuality isn't natural because it has no benefits for the human race, as far as reproduction goes.. or in other words the survival of our species?
Have you heard any modern prog bands, like Spock's Beard, Dream Theater, The Flower Kings, Transatlantic, Marillion, etc? I'd be curious to get your take on them. If not, I'd at least like to introduce you to Spock's Beard, which is my favorite band and is heavily influenced by the 70s bands like Genesis.