Thank you for the advice, Joey...

...I was actually a bit surprised that this friend of mine reacted this way. She tends to be quite open-minded, but she seemed to think that it was wrong for me to give a generous tip based on the cuteness of the waitress rather than for the quality of the service she gave us. She appeared to think that this was behavior that was typical of a male, and she was disappointed in me because in most ways I am NOT a typical male. I hate to disappoint anyone, especially those I consider a friend.