Anyway, as I was saying, homosexuality has been prevalent throughout much of history. Just about every culture has had it. It's very rare that you see a culture without at least one gay. Mahmoud Ahmadinejad can deny that gays are in Iran all he wants, but he's fooling no one.
Here's just one timeline: http://en.wikipedia.org/wiki/Timeline_of_LGBT_history
As you can see, Egypt had the first recorded gay couple thousands of years ago, believe it or not (Khnumhotep and Niankhkhnum). In fact, if you go even further back to 12,000 BC (14,000 years ago), you'll find plenty of gay cave paintings and sculptures emphasizing homoeroticism. Sappho of Lesbos may is rumored to have been a lesbian. As perhaps was Plato (or was it Socrates?), Alexander the Great (or bisexual), Marquis de Sade (who probably was bi), and plenty of other historical figures! Hell, even Julius Caesar allegedly had a gay experience. And plenty of Roman emperors in the latter centuries of Rome's existence, including Hadrian and Trajan, were openly gay or were in gay relationships.
Why archconservatives continue to act like "gay" is something new is beyond me. Why can't they just accept it and move on? I swear, modern-day cultures and civilizations are so sexually repressed. We give up tolerance for things such as pedophilia and female genital mutilation, but we exchange it with becoming prudish assholes on sexual practices we do legally allow.
Homosexuality has never been the sole demise of any culture, and I have yet to see any evidence that being gay was even one of the main factors at all! There are plenty of reasons why Greece, the Roman Empire, the British Empire, and several other world powers fell. To think that "promotion of homosexuality" is somehow a reason is just ludicrous. Is homosexuality supposed to be some kind of virus that spreads like an epidemic and infects all facets of society?