@lololulu19 One would think that, but one thing has nothing to do with the other, it's about putting yourself into the actor's role. That's why they have guys with big dicks and whatever in straight porn, because the viewer perceives the actor as himself. It's all about self insert.
And that's why lesbian porn doesn't work so well, yes lots of straight men fantasize about seeing two women, but without a man there there is no self insert, it's not the same thing.
That happens with gay porn too, you probably get aroused also by the idea of being there, not only by the visuals.
And this idea that straight men are only actually straight if they adhere to certain things is just silly, it's a backwards way of thinking, sexuality and humans are complicated, forget about those conceived notions.