facebook marketplace

Only fans, porn hub, redgif, fansly, paetron

nextdoor.com - especially if it's over the fence porn

Xhamster.com seems to have more authentic amateur stuff posted

redgifs

That's a pretty vague question; what kind of NSFW "stuff" are you looking to post?

However, if you're talking about art, then Slushe is a fairly nice NSFW art site (though it may be abandoned by it's creators, last blog activity was over a year ago) that varied artists post plenty of stuff regularly.

Reblogme.com

youtube.com