As someone with a Western mindset, I don't think it's necessary for an actor to always act with the same partner — in fact, it's even preferable that they don't, otherwise it feels like they're always playing the same character. I also don't care whether the actor is gay or straight . But the fact that they don't want to be a fixed on-screen couple might have several other reasons: obsessive fans, living under constant scrutiny, crazy people. Unfortunately, it's us moderates who end up missing out on great performances and chemistry.