I've only heard this in two contexts.
1. A chick I've already slept with that is just venting
2. A chick that is attracted to me but knows what the deal is and isn't trying to sign up for that
I respect chick number two because she's sticking to her principles. A lot of yall think a guy should try to "convince" a girl to have casual sex, but I don't go that route. She is either all in, or she's not. I'm not trying to talk anybodies panties off.
If she prefers sex in a committed relationship and I don't want that, I bounce and hope she finds the guy that is willing to pursue something more serious with her. Sometimes, later on she will hit you up when that relationship still has not occurred and now she's down for a quick bang in the meantime. Sometimes, the next guy tells her what she wants to hear, and ends up playing her. And sometimes she finds exactly what she's looking for. Regardless of how it goes down, I'd rather leave her alone and let her pursue what she wants, versus trying to be slick and get her to do something she has stated non-interest in.