I have a friend who may be considered a unicorn (she's been into swinging for, I believe, about 10 years). She's into bdsm and sm and has a master, although I'm not sure for how long. Now the fact that she has a master, I'm unsure if that wouldn't make her a unicorn
Anyway, I digress. I know that if someone approached her master and asked if they could play with her and he says it ok, then she'll be fine with it. She's a pretty approachable person, and even if she ends up not being interested; she'll give people a chance and talk to them, even flirt with them. She'll let them know, politely, if she's not interested, but if she is interested, she'll flirt a lot.