[Allenc3]

The girl might have simply just forgot, rare but it can happen. Or they just assume you know, so they won't say anything until you really leaving the room without giving.

It did happen to me once where the ML totally did not signal or ask, also never discussed pricing no GQ just went straight to the deed after flip. Somemore it was my first visit for her. I just give her $ right before I'm about to leave.