It's a little tricky to find, not so much because the location is challenging but because it's not very well-signed, Xteamworks (1752 Ave. Fernandez Juncos, 787-728-7674) is the popular gay sauna and sex plex in San Juan. It's on one of the main east-bound streets from downtown, about a 5- to 7-minute drive from the handful of gay clubs in San Juan's commercial core, about a 10-minute drive from the Condado gay scene, and a 15-minute drive from Old San Juan.
When you pull up, you'll see a two-story building with a sign/print shop on the ground floor. Go toward the entrance to the shop, and on your right, pass through the white door and head up the stairs to the second level, which is where the club is located.
Xteamworks isn't open 24 hours, but on weekends, the doors are open from 6 pm until 6 am; the rest of the week, you can drop by from 6 pm until 2 am. Some argue the limited hours are a good thing, in that the place tends to be more crowded when it is open, especially late on weekend nights after the bars in town have closed. Inside this space with an industrial vibe, you'll find a common areas with porn viewing, a labyrinth, gym area, darkroom, sling, sauna, and steam room - pretty much the typical assortment of amenities you'd expect of a gay sauna. The staff keeps things quite clean and can answer any questions you might have, and there are both lockers and private rooms.