I'm in a D/s relationship. With normal swinger friends, I just refer to them as friends. In the D/s lifestyle I'm a sub, so I refer to men as Sir, only my husband is Master. I call my swinger friends also my lovers or FWB.
Terminology
I've always referred to the man I am sleeping with as my bull, but we are in a hotwife/cuckold relationship so it makes sense.
What do you call your lifestyle playmates? Somehow calling her my girlfriend doesn't seem right because girlfriend implies a certain amount of emotional connectedness, and even some level of exclusivity. But she's obviously more than just a friend. What terms do you use to refer to your lovers?