I think the biggest issue with porn is that it objectifies women and gives an unrealistic view on what sex is. You don't have to watch porn to masturbate. Lots of people can just do it without the extra stimulation.

Watch porn doesn't have much to do with making friends. No one can smell it on you or would care. I think they would care more if you took a bath this morning than if you watch porn last night. Although calling a girl a slut and expecting her to have sex with you most likely happen.