Porn contains: big boobs, big cock, fucking, husband and wife, risky public nudity, risky public fuck, outdoor fuck, outdoor, passionate sex, real amateur, risky.
Porn contains: big boobs, big cock, young, risky public nudity, risky public fuck, public flashing, teen public flashing, woman fantasy, outdoor, risky.
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.