As the title says, men tend not to value sex with a woman unless they have paid for it in some way, whether that's by impressing her with his career, job, accomplishments or stories, by taking her out on numerous dates, working hard to pursue her and jumping through many hoops before he "wins" the ultimate prize he is playing for - sex!!! Men don't want to be part of a club that would have them as a member so it makes no sense to them that a woman would want to go to bed with them soon after meeting them for whatever reason she has to sleep with him without any expectations.

Change my view.