Deviantart had its vogue about 15 years ago; PixIV is a Japanese website with very different style/social norms; and Pinterest is not really for posting original content (also it's an overwhelmingly female-used/focused website, and I don't mean the LGBTQ ones like Tumblr, so less friendly for sharing booby pictures).
I've been on dA for 13-14 years. It was already on the down trend when I joined, but it still had very active communities. The day that sealed the fate of the platform is the transition from a freemium economy to another, if I recall, and how amateurish it was dealt with.
One day, they hacked into the capacities of the free version, removed and replaced the premium version by what they called "core", about the same but twice the price.
When people complained, they received an extremely arrogant, antagonistic and tone deaf response from the CEO, making an analogy with capsule coffee machine vs french press with the overall message "when your time has value, you don't mind paying for it".
Which in the world of people used to have the adjective "starving" next to their profession name, passed as you would imagine and most of my friends left in protest, many still wishing the CEO to taste some french press coffee when the platform would die out.
PixV...Yeah that's mostly for porn, and it's not very well known in the west, it's mostly a korean/japanese thing.
Willingly or not, they have that label, pretty much like Onlyfan. I know some people who draw regular anime art on it, though. As an artist, what I'm looking for is a plateform to network with likeminded people, which includes means to network, non predatory business model, active public, non-absurd TOS on intellectual property (facebook is out) and sensical view on moderation and censorship. I've been recommended Instagram, but my first forays seem to indicate you have to pay to get views there....so I don't know.
Tumblr wasn't like PixV, in the sense you had a nsfw community, but it was adjascent to a vanilla sfw community. Pretty much like Twitter today. Artists liked it very much because it allowed them to have eyeballs on their art and to network with one another in whatever level of safety they were comfortable with. When they removed the nsfw community, the sfw community disapeared also
I'm pretty proud of
"Have you ever gotten an embarrassing erection in public"
"Yes but he apologized later"
Pff lol