I have always had the donation in a card to present to a lady. And I have always taken a bit of time to send a "Thank You" afterwards.
If the lady does not take the time to respond, then they are off my list for a repeat encounter.
Had a less than splendid time with a lady once, but she replied saying that she recognized that she could have done better. Our encounters since then have been absolutely off the charts!
Guess it is just me, but a modicum of civility goes a long ways with me.
My dos centavos and worth what you pay for it.
El Coronel