I wouldn't care if OH went to a stag do in Amsterdam. I'd imagine that there is probably slightly less chance of them making it to a strip club in Amsterdam actually:
Normal stag do - get drunk, go to find strip club, find strip club and continue drinking there.
Stag do in Amsterdam - get drunk, get stoned, go to find strip club, get very confused and a bit freaked out by trams. Perhaps find strip club or perhaps just return to safety of bar/coffee shop and continue to smoke/drink.
I'm also not that bothered about OH going to a strip clubs on a stag do. He's told me he has and that he doesn't like them. I've been to a few, one was horrible, sleazy and the girls looked like they were doing it for their next fix... I'm sure that one had a prostitution sideline. I felt sorry for the girls there. Another one really wasn't that sleazy at all.
Someone I vaguely knew worked as a stripper in one of the more reputable clubs in London. Worked a shift a week to pay her way through university. Earnt good money. It was a 'no touching' club, no prostitution sidelines, taxis straight home post shift, etc.
I trust OH not to sleep with a prostitute. If I didnt I wouldn't be with him. However I have heard stories about people I've known and been surprised that some people have, makes me wonder how many guys have at some point.