Porn plays a normalizing role in bourgeois sexuality. What you watch on the screen you assume is how human sexuality generally is. Porn is generally made, even amateur porn, so that it's visually stimulating. So people who watch porn passively strongly emphasize the visual in their sex lives, which usually equates a ham-handed approach to sex. The taboo aspects of sex are also highly emphasized, as porn is often marketed for shock value. This makes people get desensitized and have to do more and more things they think are "taboo", which are actually inherent transgressions -- i.e., part and parcel with "plain jane" sex. E.g. They learn not to say "was that good for you?", but fail to understand the real reason that asking such a thing undermines the experience.
99% of porn is not very skillful sex IMO, even if it's visually exciting. There is camera work and decent directing, but it's more about the visual stimulation for the audience, not for the actual pleasure of the people involved, which makes it inherently misleading and extremely self-conscious. The actors and amateurs want to conform to the normative sexuality, so this becomes how people have sex -- self-consciously. "Dirty" sex is fun, but emotionless dirty sex is disgusting, IMO.
I think if more people started treating porn more clearly (especially the producers of it) -- as often entertaining sexual education -- a lot of relationship problems would disappear. Idyllic visions aside, right now there are some tantra teachers online who make ars erotica type videos that blow all the pseudo-scientific sex advice (i.e., most or all the advice most people encounter) I've ever read out of the water.
