If it's purely for the physical pleasure and someone has a limited range of emotions, maybe not. This is where I wonder if statistics on sexual orientations are even meaningful. There are differences between what people would admit on a paper survey vs what they've actually felt and experienced vs whether their inhibitions let them act on those feelings. Maybe some men have to be stranded on an island with a bunch of guys before they even realise they're bisexual. But if they're only attracted to the guys with the most feminine features, it probably doesn't count.