I was there last August. Before I left somebody wrote that August (obviously peak season) was an off month. It wasn’t from my experience. These places are variable no matter what the season. As I always say it only takes one to make an evening!
The no prostitution sign is in the booth where you pay as you go in. In other words directly behind the guy at the reception desk. In was certainly there in early September on my last visit. Not that it is a matter of great importance.