If you're into playing Medic, you'd probably like BDSM.
Don't believe me? BDSM stands for Bondage, Discipline, Domination, Submission, Sadism, and Masochism. All of which are the core tenants of playing Medic.
Bondage: You're a slave to your pocket. You may as well be tied to them. Just like being tied up for sexual reasons.
Discipline: When you fuck up, you stand to lose the most valuable resource in the game: your precious Ubercharge. It's a harsh punishment, as is being hit with a whip.
Domination: Playing Medic requires a love of punishing the enemy team with your aforementioned Ubercharge. Just like dominating your partner.
Submission: You have nothing to do but follow the stronger classes on the team. Just like being dominated by your partner.
Sadism: You derive sexual pleasure from a good push with your patient, inflicting pain on the other team. Which is the same as inflicting pain on your partner.
Masochism: You enjoy your own pain and humiliation, both on the fault of you and your team. This happens a lot, with how much of a target you are. So much, in fact, that the only way you can possibly put up with it is if you derive sexual pleasure from it.
Maybe you should go check out /r/bdsm.