Unless one is consuming ethically created, women directed porn (which is not most of it, and costs money) I think it's nearly always teaching the opposite of good sex. Most women need more than 30 seconds of foreplay, don't want to be jackhammered all the time, and can't come from penetration alone. They don't want to be slapped or choked or have spit dripped in their mouth. They don't want to be deep-throated until they cry. They don't want a cock that's been in their ass to go right into their pussy without it being thoroughly cleaned.

Real kink communities are based in active consent and communication, where scenes are discussed beforehand and the sub actually has the bulk of the power. That's not what porn depicts.

That being said, if a couple communicates well, they certainly can use porn to kick off discussions about things they like and don't like, and what they might want to try.