While most of these sites are not strictly billed as adult platforms they are the best I have found so far for pornography, erotica, and more! … My personal favorite platform is the messaging app Discord. There are a blossoming number of communities here and while it can be difficult to find them (you have to be invited by a member) I find that this allows for individual servers to control the less pleasant people that may seek access. I also like how each server has the ability to organize itself into channels that each have a certain topic. It is a valuable resource when you are picky about the type of porn you enjoy (like me!).