Please, not that old chestnut!!. No means no. The problem is some women are weak. They don't say no hoping you will coax them into what you think they really want, which is you, sex, a kiss, whatever.
They are just weak, maybe double minded.
The best thing to do is give her space. If she says no, step back, observe, give it a day. If she has time to think about it, she'll know what to do.
Women, particularly young women, have a need to be needed or wanted. That's why they send mixed messages. The "no" is no to what you're asking, but they give in because they feel it's the way to keep you around. Don't use this to your advantage.
Be kind. The best woman/relationship is had by letting her decide what's right for her, not by coercion.
Lately I have been researching why women prostitute their bodies. I have seen women do things to their bodies that are painful and dangerous and unless they are being forced into it I wonder why they would do this...