Tipping.
It's generally accepted that giving is more joyous than receiving. I know this applies more to sharing and caring than to tipping but I do tip working girls as a matter of course unless they have really pissed me off for one reason or another. Why? Because I believe it makes a difference about how they feel about themselves and what they do for a living and more importantly it gives them a sense of achievement feeling that the customer was happy with their service. I also believe it makes a difference to the experience you will get if you go back for seconds. The amount is actually not that important, it's as they say the thought that counts.