Well, I've been a member of Deviant art for some time now, but I never uploaded anything...
Why ? maybe because as I'm on Pixiv mainly, I thought "Oh well, that's enough..." And I saw that sometimes, the guidelines of Deviantart are a little wonky here and there, and not as permissive as Pixiv (and as I do a LOT of adult stuff, I was worried about that...)
But now, as I have some stuff that could pass easily here, I thought "Well, why not ?" ^^
(But the really adult stuff I do is on Pixiv, and you will need an account there ^^)