I don't want to seem to be teaching you younger mongers anything, as I'm sure you're very experienced in many aspects of the hobby. But if I may offer a few pointers to those who are still in their formative years.....
You have to build up a relationship with the girl/lady. They need to trust you. You have to have been there for a couple of times, let them trust you, treat them right in every way, and you will have a GFE in several places.
It takes patience. Maybe unfortunate but worth every bit.