We have chats at work and we discuss all kind of shit there. I imagine if you have chats in a sufficiently large organization then yes, some people would talk about sex stuff. No big deal, in my opinion, as long as nobody's in the audience who doesn't want to read this.
If you take the collected chats of every company with more than 10,000 employees, then you'll find "sex chats" with 99.9% probability.
It would be different if chat rooms specifically for these topics were explicitly and officially created. That would raise questions.