A woman's hottest fantasy is to be impregnated or at least have sex in a natural, no barriers, no holding back sort of way. It's part biological and part "because it feels naughty" especially if it's casual hookup. Even though she might well be on the pill, she will likely "pretend" in her mind that he's impregnating her for some extra erotic thrill. If she's not on the pill or some kind of bc, she's (consciously or unconsciously) getting lost in the moment and letting the "fantasy" take over.
She usually can't tell the guy this because it might freak him out. So, she has to be sneaky about it by doing one of the following....
1. Not say a word about condoms and hope he doesn't use one or bring up the topic
2. Tell him she really wants to "feel him," or it would feel better without one
3. Say she's on the pill (whether she is or isn't) and hope he takes the "hint"
4. Mount him quickly or guide him in raw without saying anything about it
I remember one time, this girl used #1 on me. We started fooling around, got naked, and she says, "F me." No more game required lol. So I reach over and grab a condom. The look on her face changed from excitement to a slight eyeroll/exasperation. I didn't quite understand that at the time.
I put the condom on, and we still had great sex. She was so horny that she wanted to either way. But my point is, even though it was a ONS, she actually wanted to go raw. She just didn't want to say it. She was "passively" hoping I'd take the hint and just go raw. What she gave me was a slight look of disappointment when I grabbed the condom.
Anyway, this scenario is quite common.