Is there a stigma against couples...

Is there a stigma against couples in strip clubs? My wife and I visited Diamonds on Saturday April 17th. (The 2nd time we've been there.) We sat and watched the dancers... were NEVER approached for a dance... (I love watching my wife get a dance) and ended up watching the Calgary/Vancouver hockey game. We have not had much luck at any of the Denver area strip clubs that we have been to as a couple. Granted the dancers were attractive, the action was nil.