Apologies if this has already been asked before... my partner and I are going to Amsterdam next month and are interested in finding a girl for a threesome. Is this something that happens? Most of what I've read on here only refers to single men and wondered what the etiquette was for couples, or if that is just something that doesn't really happen

I have done it. It was easy and safe. My wife was embarrassed to have her come to the hotel since we were in a very high end place and I had to meet her at the door and walk her through the lobby. I got a woman every night I was there.