only serious life examples and no judging please..

I am wanting to surprise my man with a threesome when we go on vacation next week.  This is something that has lightly been brought up in conversations, we completely trust each other, and are both very open minded people, we would both look at this experience as just sex and that's it, no emotion, no attachments, we would never see this person again. If you have had a threesome let me know how it went and if you enjoyed it or not.