I don't know, I'm very sex-positive and I enjoy porn. Sometimes I even learn new things I like from it. I don't think for a minute that it's real and I would not apply it to vanilla people (my more kinky friends however yes if I know they're into something).
I don't really think my stepsister will get stuck in the washing machine. Does it form sexual behaviour and practices? Probably yes. I'm sure a lot of people try squirting now, which was popularised in porn. Is that bad? No, I don't think so at all. Why would it be? Sex knows fashions just like other human behaviour.