Porn contains: car sex, caught masturbating, public blowjob, outdoor, outdoor blowjob, cum slut, sex doll, perfect ass, perfect body, fit girl, hard cock.
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.