From all the mouse clicking that is. It's a light resource management game that requires you to click a LOT (to gather resources fast enough and to speed up activity). Very little lewd content, it's basically a few not too X-rated cartoon drawings; for me the fun is in the fact that there doesn't seem to be a very obvious path to the highest score, besides clicking fast so it's actually interesting to try different tactics. One run through takes about a good hour so this gives you plenty of opportunity to try other approaches. Drawback is that it's quite fast and frantic as you're constantly moving workers to new activities. 4 stars for me, would recommend to buy it at a sizeable discount like I did.
