it's not possible by definition. how is someone a lesbian if a male is involved during sex? same goes for gay male having sex with a female animal, how are you gay if you are having intercourse with a female? using "it doesn't count, because animal" or putting animal sex to entirely different "category of sex" sounds all kinds of offensive... as if they weren't equal partners because of their different species.
I'm into the physchology behind of preferences rather than labels There maybe circumstances causing people to choose different ways in relation of humans, maybe..
If i choose to be a gay, i am thinking can i be with a female animal, i am not sure. But if there are people, let's say he is gay 100% and has interest in relation with female dog or horse etc. nothing to add of course, just curious how it works behind