I can't speak for anyone except myself, obviously and generally try not to. I'm straight, male and don't care either way if there are dicks in a game, but if a game allows it, I usually play as an FMC.
For a variety of reasons, such as I think two girls together are hotter than one guy and one girl, and also if the FMC is written well it can be interesting.
I haven't tried playing the male MC in this game, but apparently the differences are minimal, story wise. And I am fairly sure a certain scene with Kate would have affected me differently if I'd played it as a guy, and that detail in itself is interesting. It's still an unsettling scene.