Homosexualism as well as Pederasty was common in ancient Greece as well as in the Roman Empire, with the establishment of the semitic (abrahamic) culture and it's ethic rules in the Roman Empire it more and more disappeared from the social scene.

Today within the new, this time western 'empire' we see the same. The reason is, that one can keep large unions (empires) only if one allows all sorts of personal freedoms to the individual, so he has no reason to rebel, even if those freedoms are not as 'normal' as one may hope.