Adultism is a freemium site, so your level of access to their ever-growing stash of amateur porn is based on your contribution. Free users can beat off to pics until they’re raw and bloody, but they cut you off when it comes to videos. New members get a few free ones, but you’d better choose wisely.
To get full, unfettered access, you’ll need either a Gold membership or Uploader status. In case you’re dense and can’t figure out from the titles, Gold is for people who pay for it, and Uploader is for people adding porno to the collection. Considering their extensive set of rules, anything you upload pretty much has to be your own.