http://www.cluberoticakc.com
You don't have to be invited. If you are a couple and you have never been there before you will need to call and talk to Poker and let him know you are coming and get the address. If you are going as a single guy, you definitely need to call him every time and ask if you are welcome. He limits the number of single guys based on how many couples are there.
As far as looks, it totally runs the gamut from stripper hot to overweight 60 year old housewife (and comparable descriptions for the men). I'll never forget the time I walked in and saw this amazingly hot blonde going down on her boyfriend and a few other guys -- and then three weeks later saw her working as a waitress at a bar I stopped in at. She didn't recognize me and I didn't say anything.
Go check it out with your girlfriend. It is free to take a tour and to stay only costs $30 for a couple.