Gay Pride Parade or going mad!

I watched Gay Pride Parade on TV with a feeling of disgust. Going gay or going mad? Legalizing homosexuality will breed more homosexuals. If some are born with peculiar personality let them do it. But how come a large number of people turn gay? I don't believe all gays are born with a personality disorder. Homosexuality is against Nature's rules.
Such relationship often starts when boys and girls of the same age group will have to share one room in hostels or anywhere else. As they share the room they start sharing their personal problems too. They may talk about everything including sex and show their bodies to each other thus keep a close friendship. At first they may feel strong attraction. But there is no guarantee in such relationship. Human mind can change with time and circumstances. some get married and when they feel it is not proper they try to live like man and wife. One of them will be compelled to dress up like boy or girl and even go for sex change operation. And break up is possible.
Sexual desire starts in adolescence but we, human beings have to wait till marriage. So this is the only option to seek relief when hormones rise. And don't have to fear pregnancy. Animals don't have to wait for marriage. When they get mature naturally they start mating. So they don't become homo.
Though unacceptable, in a way it is beneficial. It is the best way to control population. It must be the Nature's way to bring human beings to extinction because Mother Nature is fed up of human beings. Now she realises the mistake in creating humans and that too granted with two hands instead of four legs. It is like offspring torture their mother. Seeings all these problems it seems the world is coming to an end in December 2012 as predicted by the Mayan and Inca tribes.