I don't think it's only porn that has taught boys/men that their pleasure is the most important thing, (although that's certainly a part of it) -it's the whole patriarchal culture. But I do think that boys (and many girls) growing up with porn as their primary sex education have been taught transactional sex as well as a lot of "moves" that don't actually appeal to women or feel good to them.

I have nothing against porn from a moral standpoint, but I do think it's led to a lot of bad sex.