All right, let me weigh in here for a moment...
Yes, once many guys get sex they're gone. After all, to them the woman is just another conquest and something to brag about.
But there are a lot of guys out there who are willing to respect a woman's wishes when it comes to intimacy. I'll mention this now - the first night me and my future wife were really getting physically intimate she stopped at one point and thought we should wait before going all the way. I respected that, and not just because I was waiting her out. I wanted her to be comfortable with it. Yes, we did finally sleep together the next night, but it was because she was ready and not because I pressured her. Plus, I have been on plenty of dates where the woman made it clear she wanted to get acquainted first before ANYTHING, including kissing. We still wound up having a pleasant evening.
The point is meeting the person with respect, and that is easier said than done.
Oh, before anyone thinks I'm portraying myself as a saint, I'm not. I've had plenty of experiences where I jumped into the sack with someone the same night I met her. It was consensual, and quite often pursued by her first. Yeah, I just went kicking and screaming, didn't I?