I've been to PR a few times.  Unfortunately, the scene died long ago.  Here's a good history of it:  http://www.wikisexguide.com/wiki/San_Juan  
If you're looking for that sort of fun in the Caribbean, the D.R. is a much better time.
Tourist tip: Take the ferry from OSJ dock to Catano across the bay and catch a taxi to the Bacardi distillery.  Unfortunately, the tour is no longer free, but should be worth it if you enjoy such tours.  The best breakfast in OSJ is at the legendary Cafeteria Mallorca on San Francisco street.

There is a little FS strip club in San Juan. Frenchies is the name. Check that out, I was there a year ago and had an amazing time. it was a little shady of a place from the outside, but once you were in the bouncers/ women made you feel safe. 2bills and pick your girl