some straight guy i was friends with was obsessed with me. he only cared if i liked men and had a bf for some reason, and would ignore that i liked women. he would act like i was straight and that if i dated women, that just meant i was single and obviously interested in him.
I can see this. The draw of lesbian porn is no penis except the one in your hand.
I guess the TLDR is just that men are generally only jealous of other men.