Wouldn't even consider it with a one night stand. Would he a big hell no with my wife/partner. I have standards, like I'm sure many have here. It's more enticing when you and 2 of the opposite sex are in the mix though.
Hahaha I thought about this but it'd be so wrong.
BTW, I wouldn't mind dating a girl who's already had a threesome. It wouldn't surprise me if the girl I'm seeing already has been in some since she's the one that brought it up. Now it's a matter of do I want to put up with a MFM in order to get to MFF? :lol
Girl I'm seeing told me this story the other night: She was at some theatre camp a few years ago where the men and women had separate cabins. Somehow my girl and another girl ended up making out and getting naked in a bedroom, and then got walked in on by another girl. My girl, without missing a beat, looks up at her and says 'join us', and the other girl takes off her clothes and jumps into bed with them.
I wanted to high-five her after hearing that story. If I were a woman that's how I'd live my life...