Yes, perhaps the seeming increase of homosexual relationships is part of Gods plan or strategy for limiting or reducing the human population.

After all everything without exception, is supposed to be created by God who is supposed to have a "plan" for humankind.

Stezza,
Male bisexuals are almost always homosexuals who will have sex with women under certain circumstances but almost invariably only enter monogamous relationships with other gay men, though I understand that female bisexuals may be genuinely sexually ambivalent, put that down to gender differences.
I can't find the original thesis on which I normally rely to back this position, It was on my old computer which went to heaven just before christmas, since you're insistent on evidence and bibliography this link is the best I can give at short notice.
http://www.bitheway.co.uk/2008/08/16/are-all-bisexual-men-closet-gay/

Daffy.
You're forgetting Satan, if you take God seriously you have to take the fallen one seriously as well because he too has a plan for us all.

David F,
Good luck with that, most traditional societies don't even have a word for homosexuality with which to conceptualise the practice and you're talking about converting a billion Muslims, a billion Third World Christians and three quarters of a billion Hindus.

I cringe every time I see the Pope uttering his utterances which are normally a whole lot of .......I am sure if JC was to return to earth he would not be dressed in an exceedingly expensive white outfit, plus funny hat, nor riding around in a funny popemobile, yes you can pontificate all you like and keep the Catholic church going by having all of those poor countries not using contraception and then bleet about how we should look after the poor, which is in your own making, one could go on for ever with the stupidity of the Pope and all the Popes before him.
I do agree with David and Daffy Duck.
As I am and Atheist I do not have the hang ups with Gay marriage, and as others have pointed out perhaps it is a way to control population explosion as is happening now, on the subjest of Hetero changing to being Gay perhaps some men require more than the missionary position, during their married life, perhaps men are the answer.

Yeah I'm sure the Gay lobby is going to be thrilled about a bunch of nutty old heterosexuals promoting the Homosexual minority group as the agent of global Genocide, do you guys even read your own posts?
If you want to commit global genocide just say it outright, why not lobby the U.N to round all the third worlders up into camps and nerve gas them? That's what you want after all, so why put entire races and cultures through the agony of watching their own people die out?
You do realise that promotion of genocide is a crime under international law?