My GF at the time and I had discussed a threesome; she was bi-curious (so she said) and knew that I too wanted to enjoy the juicy double-header I had seen in so many porno flicks.
We talked it out until I thought my jaw would break. Finally, we came to an agreement. We wouldn't recruit any of our female friends, as that would get complicated. She, not I decided to enlist the services of a semi-pro, a lady with whom GF had worked but didn't know well.
The lady readily agreed to our illegal proposal, although no money actually changed hands.
Ah, the perfect setup. GF dimmed the lights and put some seductive music on the stereo. I was j
oined on the bed by two lovely, naked women

and the fun began...
I kissed GF passionately as she tentatively reached for the breast of our new friend...then I too reached for the woman and....BAM!!!!
Lights up, music off, GF screaming in jealous rage!!
Here's the deal for me: I understand that bi-girls and lesbians are becoming more adventurous and outspoken about their desires. Just go to a local "gentlemens club" and see how many girls are paying strippers for lap dances.
However, if I see a heterosexual or lesbian couple entering ZB, they will soon have a new exit, as I crash headlong through the wall to escape.
The problem is, you, I and many others make this hobby part of a continuing lifestyle. I suspect that most couples would treat it as a thrill ride, once done never repeated. It would give the neo-liberal, Oprah-watching, in touch with her wild side gringa something with which to shock her girlfriends over a latte'. I want none of it.
End of sermon. If you're in a dyad, and your GF/wife/sex slave wants to play with pro, take it to Amsterdam or elsewhere, please.