How do you know when a no means no with a woman and it's not just a shit test to get you to work for it? or to make herself feel like she isn't a slut?

Say if you have a girl over and either she's single/taken/married, and she's putting her legs on yours and is acting cuddly, touches my pants pockets (so shes near my dick) and then later points out how the sexual tension in the room is high?

I went for the kiss and she turned her head, but I got her neck and bit it a little. Let me do it for a couple seconds then slowly pushed my head away.

Later I have my hand on her thigh, slowly led it up to her pussy, and rubbed it through her pants. She once again didn't stop me until a few seconds later and slowly removed my hand.

I stayed calm and didn't say anything and just laid back down.

So how the hell can you tell when it's an actual no, and it's just a shit test no?