Had sex with a girl in college and my hallmate was in the next bed banging her friend. I do kind of regret that night because of the girl. When I asked to switch, the girl I wanted was spent so that didn't happen. But they started on me with hand stuff, and then the pretty girl went over to my friends bed. So I was left with the decision, do I bang this girl who is DTF? Eh, So that's two couples swinging, but not quite cuz we didn't switch.
TRuth be told, I did bang the other girl a few weeks later, and then again. She may or may not have had an abortion. She told me she had to have her period induced cuz of end of semester stress and it never came. SO she induced. I would years later believe she had an ABO.