There are a couple of big sites for writing that might be worth looking at, especially if the content is outside the style that's appropriate for here ...
Literotica.com is, as the name suggests, more into the erotic type of story. Also includes a lot of BDSM content. Site owner is fairly strict with the content policy - any characters doing anything sexual or suggestive (including nudity) must be strictly over-18.
Storiesonline.net has a much less restrictive content policy. Almost anything goes provided characters are over 14. You can run across some very disturbing stuff, but also some gems.
Wattpad.com features quite a lot of spanking stories, which surprised me. And wow there are a lot of One Direction spanking fanfics on there.