I go into a session with the donation previously agreed to in my front pocket, and then a few extra ($40-60) in my wallet. If the session is so good I want to tip her, I pull the tip from my wallet and add it to the donation while she's watching, so she knows specifically that she's being tipped (though I don't explicitly say so).
If I miscounted the donation and left more than I intended, it would be hers (my stupidity isn't her fault). I probably won't even realize it, but if I do I figure she will put it to good use, and I'm sure she won't feel bad about it. It might even make her more eager to see me the next time.
Cheers,
bcg
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