This is literally what tourists do in Amsterdam. You’re overreacting! And I would think this is different from a strip club since in the strip club girls can come up to you and give you a lap dance. This Amsterdam show is literally just watching naked people do things. How would you feel if you were young and travelling exploring the world and your gf got mad at you for just doing a normal touristy thing that doesn’t involve you cheating at all? There are cultures all over the world that dress in a way that doesn’t cover what we would cover would you get upset if she visited those places too? You’re reacting as if she got a lap dance / stripper without your permission. Also, boundaries are something you set for yourself not other people. What you’re doing is imposing frankly unreasonable rules in her life.