Well a few people know this but OcUK doesn't...
This happened around 1.5 years ago in Sweden... can't say why I was there as it gives too much away but I was there with some male friends, lets call them X and Y.
To cut to the chase, in 48 hours I had sex with 3 different girls... however not alone!
The first night me, and X and Y all had sex with the girl at the same time in the hostel.
The second night it was me and X (with a different girl) at the same time (Y had passed out drunk).
Night 3 we were in a hotel in Gothenburg and I met a girl who I was taking back to the room alone (X and Y were heading home together with ANOTHER girl!). However, I realised they had the hotel room key (and being drunk I didn't think of getting another at reception). So I phoned them and they got out the taxi and came to meet me.
We all went back to the hotel and me, X and Y again had a foursome with this girl.
There was no "crossing of swords" so to speak, however I at several points you might describe the girl as being "water-tight" if you can imagine...
So in 48 hours = 3 different girls, foursome, threesome, foursome! EPIC!
Absolutely 100% true ... we took videos each time to prove it!!