In lot of the more popular sites if you try to search for amateur porn it’s far from amateur. Sometimes you can find some gems but you need to dig a lot among lot of pro or semi-pro porn. Reddit seems to be better for pictures and some short clips only. I prefer long videos without any editing or that involves some kind of planned sec scenes. Some of the more popular sites I have tried are:
* pornhub
* xhamster
* xvideos
* motherless