Some of us have, or have had regulars. The most obvious reason is usually having a good connection or having a comfort zone established. And sometimes in that arrangement those regulars might go a little beyond just trading money for sex, and dare I say it, become to a point "friends". (Yes, I've already heard the whole "...if she was your friend she wouldn't make you pay" debate on that.)
So these 2 questions are for both the guys and the ladies:
1. What's the nicest thing your regular has ever done for you?
2. What's the nicest thing you've ever done for your regular?
This could get interesting.