In the past, I have written a myTake on why women have sex on the first date, and on the contrary, it is because they feel as though you've established a strong enough connection to want physical intimacy. That connection is purely sexual attraction, and can be sparked with intense eye contact, positive body language, or with playful banter during flirting, but where's the love, the actual feelings?
With sexual attraction at it's peak, and and an emotional connection at it's purest, because sex is succeeded by these feelings, it is a special time. You would not want to have sex with someone you don't find sex with someone you find attractive, but with women, they also do not want to have sex with someone that is meaningless to them. They need to feel that emotional connection in order to come close to the idea, and that connection can't be established on only the first date.
That being said, most women DO need an emotional connection in order to have sex. If you're able to appeal to her emotions within a few hours, that's great, but it's just too unlikely to happen. To have an emotional connection with someone is to have a sense of trust, and during the first date, everyone must look out for:
Possible STD's
No one want's them, and this is a surefire way to repel anyone from having sex so soon. No one knows of any diseases, and no one would want to risk catching them.
Being an Easy Catch
Her social reputation matters to her, guys. She does not want to be labeled as a slut, a whore or whatnot, and she won't give any free passes because you're attractive. How bad would it feel if you gave yourself up so easily? To be used for sex is a terrible thought that no one should ever do to you.
Future Sex Becomes Meaningless
This is one of the reasons why women hold off of sex until marriage, and although I disagree with that, having sex so soon can make further sexual intimacy appear to be dull and tasteless, because it has already happened so soon. They want the sex to be meaningful as possible. That being said, the sex can't be meaningful, if you don't matter yet, and you don't matter on the first date. She wishes to be exclusive to you, and won't engage in sexual activity unless she feels that way.
The first date is really just a fun way to get to know each other better. With determination based off of your actions, you will prove your trustworthiness by remaining respectful to you an the others around you, and secure within yourself on top of being a man. Warm her up first, earn her trust, then you can have sex. She'll need to feel like she's special to you, and that you're special to her. That's not going to happen on the first date.
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