I really don't think Homosexuality started or originated in America. I think that this has been a constant throughout worldwide history, it is a given, it's been here since the dawn of man and it isn't going anywhere anytime soon. America takes a different approach to these matters and the politicians and lobbyists fight hard within congress to make sure that regardless of whatever sexual identity, religious belief, code or creed you live by, you're treated equally as a citizen.
Sweden has taken the initiative to progressively move ahead leading the forefront for LBGQT equal rights. It seems more of a scientific and political matter more than a religious one these days (no offense to the religious), but to each his/her/it's own, I think the bigger picture may be finding equality among all the confusion.
Just my two cents.
The thing is homosexuality was never so systematically propagated, thaught and encoureged as it is today.
It's pushed down everyones throats every single day.
I don't think fucking someone in the ass was part of someones identity in ancient Greece. Nor that it was deemed as positive&brave.
Today you can't be gay and a normal person, you have to flaunt it around, go on parades, dye your hair and tell everyone how gay you are because that's your identity.
If you took away his gayness, he wouldn't have an identity at all.
I think that the suppression and repression of their lifestyle and traits (which were once very much hidden away in the closet) has been bottled up so long it has burst out of the dark and into the light. There is all of this outwardly expression of emotions that end taking a form like with the parades and all of the extra unnecessary means of outward expression. Look at feminism, women have been suppressed for so long that a whole group of lesbians got together who hate men and created a liberation movement for women to empower them. While I don't personally agree with feminism I can understand why it has become so strong as it is even though their approach comes off as toxic.