Motherless actually isn't the bastion of pedophilia that some people seem to think it is. They let all sorts of weird shit onto the site, but they remove anything illegal (especially child pornography) and report it to the authorities. They can be so fast about removing content that you can find dead links on the front page.
That said, they ONLY remove stuff that's illegal. All sorts of shit, including the shit-related shit, is available on there for just about any fetish or depravity. It can be a bit of a minefield.