The western sexual system makes physical sexual pleasure out to be a commodity to be traded and haggled for, and like all economic systems this requires supply and demand. This system teaches that women are something to be desired (supply) and that men are the ones to desire (demand). The problem is that sex is obviously more than just an exchange of goods and because of this you can see the issues it creates in our society for men.
Men are taught that they have to earn women. They have to go out and perform some grand feat or buy lavish gifts to earn that which they are supposed desire most, sex. Women are taught that they are something to be desired, their body the prize to be won, that their sexuality is a resource.
Many of society's sexual issues are a direct result of this system. Because women are taught their bodies are the most valuable thing about them they base their self worth on the amount and quality of men who desire them. Men are taught that they have to earn women with the resources they have to offer be it social status, wealth, etc. Back in the real world the facts of human sexuality reveal the issues with this socially created system. Women want sex, plain and simple. The Kinsey institute has show in numerous studies that women clearly have sexual desires, a direct violation of the sexual resource system. For men the system drives into them that they should always want sex but deep down most men don't consider themselves worthy of the price required. Guys are also are filled with insecurities and few can ever live up to the powerful image that they believe is required of them to "earn" women.
Until society accepts sex for what it is socially, an emotional and physical performance between two people fulfilling mutual desires, then we will continue to see such societal issues as poor self-esteem, body image issues, the objectification of women, "rape culture", etc.