I go to restaurants and bars often because I rarely cook for myself. I tip 20% for all servers but I tip more than that if I enjoy the server or the server shows me some extra effort. I have my favorite servers in several places and I tip them more because they are pretty, pleasant and take the time to know me.
Breast size isn’t as important to me as overall beauty and pleasantness. Yes, I discriminate. But I still tip 20% for male or unattractive servers so anything I tip extra is for my enjoyment of the experience and that enjoyment is enhanced considerably when I’m served by an attractive and friendly waitress. In a sense, I’m paying a self-imposed pretty waitress tax. And, trust me, in this world of tattoo-spackled fatties with metal dangling from their faces, some friendly chit-chat (not to mention the occasional hug) with an attractive, upbeat young lady is worth the extra money to me.
If a bunch of ugly people don’t like that fact, too bad.
My son once said that over-tipping was a way of getting strangers to like you. He was 12 at the time. Smart kid.