Going out to bars


So my man likes to go out to the bars with his friends on the weekends (which I have no problem with). We are very honest with each other so if anything happens like someone hits on either me or him or something like that we tell each other, well for the past couple of weekends it has been happening a lot to him where a girl keeps trying to dance on him or hit on him or get his number or something of that sort and it just makes me uncomfortable. Now I’m not 21 so I’m not old enough to go out with them but I just don’t know what to do because I’m not going to tell him he can’t go out with his friends