How to get back to "Guys" poker night?

My husband hosts a monthly “guys” poker night. He has been doing this for several years now. I know he enjoys it and I don’t mind at all. I always make him snacks for him and the guys and when the time comes for poker I leave and go out with girlfriends. I respect him enough to let him have his guy time. We moved about 4 years ago and met some new people and his poker group expanded. Since we moved there are one or two guys that cannot seem to show up with out their wife/girlfriend. I am annoyed by this. As I said, I respect him enought to let him have his guys night. He doesn’t know how to go about putting a stop to the women tagging along. I for one, can’t understand why, if you know it is a guys night would you want to tag along. Please if you have any suggestions as to how we can get this back to a “guys” poker night let me know.