Porn contains: big cock, riding cock, cum inside pussy, teen creampie, wet pussy, teen pussy creampie, sexy teen, cum inside, cum in pussy, creamy pussy, riding dick, round ass.
Porn contains: female pleasure, for women, facesitting, eating pussy, amateur couple, big ass teen, shaved pussy, oral sex, face fuck, real orgasm, big booty, cunnilingus.
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.