Porn contains: public blowjob, car, car sex, cheating wife, cuckold wife, hairy pussy, pink pussy, 18 year old, doggystyle, hard fast fuck, hard and rough sex, hard fuck, cum.
I'm sure it's better to search for porn with tags rather than categories. Usually authors specify a few general categories and lots and lots of qualifying tags. Here's a list of the most popular amateur porn tags. Not enough? Below is a link to all the tags used on Hobby.porn.