The problem with "Do you want to come back to my room for sex?" can be that it requires the woman to commit in that moment. A woman might very well think: "I would enjoy making out in a more private space but at the moment I don't know whether I actually want to have sex, and I want to make that decision based on how I feel in the moment"
I find this strange, because if I'm attracted to someone, this attraction doesn't change on a second-by-second basis, although perhaps its just me that feels like that. I think if this hypothetical woman doesn't know whether she wants sex, maybe it would be best for her to wait until the next date, where she might have a better idea of what she wants.
I heard some advice saying that if you're not enthusiastic about something its not worth doing, and while I'm not sure this applies in general, I would apply it to sex. No point in half-hearted sex.
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