If I can weigh in as a lesbian? Skipping content, brief content in all of heteronormative culture because it bothers you does not mean you were turned off. In that case all movies would be pornos. The fact is it often makes people uncomfortable on a deeper level. And that level is prejudiced to some degree, it may be something they don't quite get but that is prejudiced, especially since you are gay. That sex scene was made for you, and he wants to skip it, then maybe mention why not skip ALL the sex scenes that you don't find personally arousing. If not, then that is unfair, and he is being homophobic, expecting you to watch yet another sex scene that is not geared towards you, because he can't stand one that is not geared toward him. And that is the issue.
The fact that lesbian porn is made for men, and often is highly lesbophobic and has the idea that female sexuality is for men. It is something many lesbians have to deal with, in that many men see nothing wrong with trying to insert themselves on my daily existance. I say I am a lesbian and the nicest, homophobic, statement I get is "that is hot." Imagine, straight guys, if you said you were married, and a guy looked at you lustfully and said "Hot." It's uncomfortable to say the least.
Never mind guys "volunteering" to turn me straight, following us around all day offering to "donate some sperm for your baby", guys act like women sexuality has anything to do with them, and in fact an open invitation. Being silently turned on and accepting 2 lesbians will not be part of your sex life? Sure, I understand, we all got kinks. But lesbian porn itself is lesbophobic, due to being clueless and geared towards men. Nevermind half our representation is a "lesbian" ending up with a guy, even lusting after him. That is Biphobic on top of it, denying their existence once again. There are men who have told me their ambition was to do it with a lesbian, as if that is not the creepiest thing in the entire world, wanting to do it with someone, by definition, who doesn't want to do it with you.
People never treat my relationship with my fiance as legitimately as they would treat a man's relationship with her. When she is hit on saying I am with someone gains more respect than her pointing at me and saying we are engaged. And even nice people will look at me or her and say "you just need to find the right man." All of this is compounded on the driving need for many straight men to get off on us, but never support us on any social battles, and in fact actively encourage them to disregard our personhood. I don't think a guy turned on by lesbians is bad, I think lesbian porn aimed at guys giving them the delusion that lesbians, and their sexuality is to viewed by men in a way that completely disregards them as people is very very homophobic, and way too much media does it.