We don’t really know much about the Germans except for what the Romans and the Greeks wrote about them, and homosexuality wasn’t much mention, so I don’t know how you could make that claim.
I’d welcome it if you had it, but from what I remember from some desultory reading was the Germans didn’t admit that people like that existed.
I'm making a generic assumption that homosexuality has existed as a fringe phenomenon since the beginning of recorded history. I don't see this statement being controversial at all. Traditionally, Judaism, Christianity and Islam have proscribed homosexuality (in some cases as a capital crime); other religions generally have not. If anything, after Christianity became the state religion, Rome should have had fewer homosexuals than the pagans on its borders, given that this coincided with homosexuality being made a capital crime.