That’s not it at all. It’s about the power exchange, the role reversal, the idea of being taken and violated by a strong dominant woman etc. there’s a lot of different motivations besides latent homosexuality. I’d say for most guys into femdom they don’t want it to be pleasant. They want to feel violated.
its not about getting fucked up the ass so much as it is about a woman wanting to fuck you up the ass? its like how you would want to get your dick sucked but you wouldnt want a man to do it?