An open classroom at FIU
“It's SO big!” says your significant other... when you drive him/her to FIU. The campus is basically its own city, and even if one of its millions of buildings isn't accidentally left unlocked, you probably know around 100 friends with a student pass who can let you in. From there, find an empty classroom. Surely someone will want to play teacher.
A swingers club, like Miami Velvet
This is Miami's premier swingers club, which makes it a judgement-free zone. It's akin to a regular bar -- if regular bars had porn, “towels-only” areas, and a lot of horny people just kind of going at it. So uh, yeah, pretty much exactly like a regular Miami bar.