So far as the other things a platform like that can create a lot of trouble in other ways.
Personally I would go either “all adult” or “no adult” in the case that moderation in the second case is easier.
To broaden the discussion, when I use Telegram or Whatsapp, I don't go through any verification process and again, anyone can show anything to anyone. Whose responsibility and liability is to detect such things and what consequences can be?
https://www.eff.org/issues/cda230
1-1 communication is what it is. If you want to stop people from sexting you need something unreasonable like
I do contrast the failure of what people described as "audio" apps like Clubhouse to the success of OnlyFans and such. It would be interesting to see if the same tech could be successfully applied to a different mark. Call me prudish, however, but I just wouldn't want to deal with the bullshit that comes along with other people's online sexual behavior.