I do agree that porn sends very confusing messages to viewers, but it see it more of a symptom of a greater problem, rather than the cause. Go back a couple of generations and women weren't expected to enjoy sex at all. Their pleasure was irrelevant to the act. Now there is a distorted image of what women enjoy and some strange notion that all women are the same.
Pleasure is not all physical. I can look at a picture of a beautiful sunset and say that brings me pleasure without anyone doubting it, yet if I say that it brings me pleasure to be ejaculated on, that makes no sense to anyone who doesn't feel the same. Its like me trying to understand why my son likes the rather strange electronic music that he listens to. Just because it does nothing for me, it doesn't make the pleasure any less valid for him. So little of pleasure is actually physical in reality. I can feel real physical pleasure from something that doesn't touch me at all, and yes, that includes a faceful of spunk. Its all about the context and the people involved. A complete stranger touching my breast would freak me out, but my husband doing it, feels amazing.
There is also the very confused issue of pain. Pain and pleasure can be very closely linked. Lots of people feel pleasure from pain, but again, context is everything. I enjoy a little BDSM but other people would run screaming from the idea and not understand my pleasure at all. That's all OK if it wasn't for the fact that people don't generally communicate their likes and dislikes, desires and boundaries very well.
If men watch a lot of porn they would certainly get a distorted picture of what women enjoy and there is no doubt that causes a big problem, but the young men who embarked on their sex life before the advent of porn, didn't do much better. If they did consider their partner's pleasure, they assumed that the mere insertion of their penis would be more than enough to fulfill their desires.