I have been through all three sites and I have noticed that Deviant Art has been very strict over the years and yanked anything down that was inappropriate. Many artists still use it, but when it strikes a nerve they tend to pull the art down and warn the artist. This has happened to CattyN, I wish I could name more artists but I can't think of any others off the top of my head.
Over at FA (Fur Affinity) and Pixiv, you can find anything you seek. There is no inappropriate material there because everyone respects the artists and turns the other cheek if there offended by the art.
As far as I'm concerned Dev art is a dinosaur over run with Nazi's. Easy to use but careful what you post! FYI if you haven't been busted yet just wait, they're watching.
P.S.- I know minors access Dev art but there is such a thing as a mature filter and restrictions.
I think the reason that quite a few artists here use dA over the others is because Fur Affinity has a title that may not appeal to non-furry-supporters, while Pixiv is in Japanese, which few of us understand.
Besides, as long as there is nothing too provocative for even the most open-minded at dA, it should be fine.
Now THIS is love!