SuperGogeta I do actually.
If the topics cannot be seen, then there is no issues about whether there is sexual based content in them. Roleplayers can use these private discussions for whatever they like and no one else will get subjected to what they post.
Also if they cannot be seen, then no one else might get dragged here from search engines in pursuit of whatever's posted in them. Which hopefully means we get more story and in-depth roleplayers, then people searching for what is forbidden here.