Yes.
The legal age for someone to be able to be openly horny on main and openly interact with NSFW content is 18+, not 17 and three quarters. If someone were to interact with them sexually, regardless on what the kid posts on their page, that is illegal. https://twitter.com/Syeo17/status/1264335060267917313

This is why all NSFW spaces are 18+, cause it's a fucking crime to talk sexual at a minor. It's irresponsible to say otherwise because you are encouraging minors to put themselves into REALLY DANGEROUS situations.