That's probably more true than not. I also think there's a middle ground where the MC can be receptive but not overly enthusiastic or thirsty. Sort of like how a person can see another person is generally attractive but also not be sexually into them.I wonder how much this is due to the writers trying to mask the fact that certain scenes are actually rape scenes. That would explain why the mc and crew are written to be into basically anyone you run into regardless of how the player may personally want to play their character.
Ideally, I think MC should only be explicitly written to be attracted to characters after the player chooses to be receptive to their advances, or there's some sort of pheromone, mind stuff going on.