I always tip for what I consider to be good service, although sometimes if there's a rush at the end it might slip my mind in which case I try to remember to make it up as soon as I see her next time. That's what getting older does to you!

It would be interesting to see what tip-garnering strategy works best, in the sense of maximising a girl's tips. I can think of several strategies. If a girl is willing to provide a particular special service she could :

1. Say nothing about the availability of the service unless the punter asks about it. She doesn't ask for anything but hopes for a voluntary tip.
2. As in 1. but she tells the punter it will cost him $X. Some punters might baulk at the cost and not proceed, while others might have been willing to tip more but now pay only $X while still others might still tip more than $X.
3. Without being asked, tell the punter what she's willing to do without putting a price on it, again hoping for a voluntary tip.
4. As in 3. but puts a price on the service(s), again risking some punters saying no.
5. Without being asked, performs the service without saying anything about price, again hoping for a voluntary tip.
6. As in 5. but tells the punter afterwards if he doesn't voluntarily tip that she expects a tip of $X.

It's not obvious to me that any one of these strategies is going to be the best in all circumstances. Some of the strategies, particularly 2, 4 and 6, may piss off some punters, while 1, 3 and 5 may see the girl miss out on some tips. And 2, 4 and 6 require the girl to show some assertiveness that she may not be comfortable with.

Personally, I like to make my own judgment on how much to tip and so prefer either 3 or 5.