I believe that even for goyim it is immoral. I think it falls under one of the 7 Noahide laws not to do sexual immorality.
I think that men who claim to “feel inside themselves gay” and feminine or whatever, either are a gilgul of a opposite gender (female soul) or they just need serious psychological counselling
My question though is why and how can in today’s society they live openly together with no shame? I would never want to reveal such a thing about myself! Never mind do that!