strip clubs?

My boyfriend turns 18 this month and his cousin does next month and his cousin told him they're going to the strip club once he's 18. And my boyfriend was telling me about it and being completely serious about going, he knows I'm not okay with it. Is it wrong of me to not want him to? I just don't want him looking at a girl the way I only want him to at me. And with us both working an school  we don't even do stuff but every few weeks.