Considering this might also be a gym, the possibilities are up to your imagination.

You can disguise a any number of ceiling suspension rigs as attachments for punching bags of various kinds.

pull up bars also need a place to hang.


If your vanilla friends aren't too savvy you might even be able to pass off things like cuffs and spreaders as gym equipment: http://www.bigfitness.com/leatprod.html

Depending on your home gym, it can have any number of detachable bars, grips, chains, ropes, lying around. http://www.bigfitness.com/cabatbar.html