Meh, YANBU. If they wanted to look at museums or drink coffee or whatever else the other responses ave suggested, they could have gone anywhere. Once upon a time I believed stag dos were mere hijinks, but then I grew up and saw relatives, friends and colleagues suffer for what happened when the men came home. Sorry love, just swept up in the moment, I couldn't say no in front of the lads, everyone else was doing it, what was I supposed to do, stand outside? The secrecy, the things half a group knew while a wife or girlfriend was unaware. The first few times I thought it was a one off, then maybe a two off. Then it just seemed that no one could have a pleasant stag do anymore. It was never just a few drinks. I couldn't believe that even a strip-club was considered 'too tame' for some - they moved on to a brothel. "Just don't tell her, mate, what happens here stays here ha ha yolo lol."
Dickheads.
Sometimes I even think an affair would be better - that a man has formed an emotional connection to another is at least preferable than that he shrugged, whipped out his wallet and had a soulless under-a-minute fumble with a girl who didn't even like him.
Thankfully my DH turns down these offers, and has walked away from nights out where someone's suggested strip clubs or such.
I just think less of men who go along on these activities. The money lost, the way they look at and talk about and objectify the women. Yeah, alright, there might be one or two who back out and stay in the pub, and then get mocked, ha ha pussy whipped, I've seen that happen too. All in all it creates conflict and bad feeling for any man not wanting to go along with the strip club idea. So you have men who avoid it entirely, men who go along with it to 'keep the peace', and men who go along but do not enjoy themselves nursing a beer with one or two other rebels.
I don't support strip clubs. I do not think they are good places, I do not think they are 'just a laugh'. So in turn, I don't support those who keep them in business.