Folks usually come to Wolfshape Grotto for a specific reason. And it's exactly the reason you might think: because grottos are awesome and scenic, and when you look at this one on a map it's kind of vaguely shaped like a wolf.
That's the main reason, and the only reason. It's not because when you hang out there at a specific time of evening you slowly start growing fur and fangs and begin bursting out of your dress, and feel something dark and wild awakening within you, a heat and a madness that drives you to mount the first person you see, who is probably experiencing similar changes. That's not why people go there. I mean, sometimes you go to take in the grotto, and you stay for the bestial abandonment of all inhibitions. But those are two separate things.