Show your driver license to get in?

Having visited OZ, DD and Oasis before, I decided to try the only nude bar in the St Petersburg/Clearwater area to see how it differs from these topless club. I got there 15 mins after 7 and there were about 10 cars in the parking lot. When I get to the door, the guy asked me for my driver license and I thought that was unusual and asked him what he was going to do with my license. He mentioned that he was going to make a copy of my license and I say WTF, why and his answer was that they have had some issues lately with some of the customers and that was the only way to make sure that customers in their club was safe.

When I pressed him to explain how getting a copy of the license was going to ensure that and he said that they've a database of all the troublemakers and at that point I told thanks but not thanks....there is no way I'm giving my license to a SC to get it copied. I'm not sure what that was all about but if that is what they do with all their potential customers, I don't see how they get any business.