Boyfriend going to a strip club

My boyfriend is at a guys night with his friends at the moment at a strip club (he's never been to one so was like yeah sure why not) am I wrong to be a bit upset/irked by this?? I tried not to be but I don't like that he's seeing other women naked when we're in a relationship. Not sure if I'm overreacting? Should I just let it go because it's fun/a new experience? Help I feel like I'm being whiny and don't even want to bring it up for that reason