I had just finished a story and polishing and was looking to post somewhere, after reading the post rules of ClimaxConnection, Frolic Me and all the other erotica places, none of them really allow contents pertaining to rape... Like not ever, they don't say they forbid violence, just rape in general. I certainly understand the concern, but perplexed by the fact that CHYOA might be the only place I can share my fetish in forms of erotica in my own writing, smh.
Dunno. Used to write for some other sites a long time ago, but I never really felt the urge to push the limits anywhere but here. Seeing as I've been writing rape stories here for over a decade, I don't quite get the concern, as to this date, I've apparently completely failed to live up to expectations and become a serial rapist. Must try harder, I guess. The site here has always been pretty non-judgmental, so... far as I'm concerned, if it ain't broke... don't need to worry about it. Unless the check engine light is on, then just take out the bulb and pray.'
Editthis has similar rules to CHYOA, but they aren't enforced very well, so I'd consider it to be more open. Literotica only bans bestiality and pedophilia, meaning it allows certain forms of violence over CHYOA. I've seen some pretty fucked up stuff on fanfiction.net, Wattpad, etc, so either there are (somehow) no rules regarding sexual content on those sites, or some stories slip under the mod's radars - which isn't unreasonable given the immense popularity of both sites. I think CHYOA stands out because a) it allows themes other than flowery innocent vanilla sex, b) it has an interface that wasn't designed last century, and c) it has more than like three people in its community. Honestly, after extensive research, I doubt there's a site other than CHYOA that meets all three criteria.
Perhaps, but my stories are usually extremely brutal, I was contacted by some other sites’ moderators and they outright denied my writing. Right here on CHYOA they always approve my chapters, paradise fam.
Now that I recall, there's also Adult-FanFiction.org, which is reasonably popular, has a relatively good interface, and I should imagine allows underage content, because I've stumbled upon it several times in the past. I suppose that's a benefit of hosting servers in a more liberal country, if you personally have no qualms against it. However, about three or four new chapters are written under Original Fiction per year, from memory, so it's not the best place for readership unless you're writing actual fanfic. Still, if your story is too hardcore for CHYOA, Adult FanFic is probably your best bet.
ASSTR (dating from the Usenet days, alt.sex.stories text repository) may be more open. I don't know how active the community is in discussion with each other, but there are new stories going up frequently. https://www.asstr.org/