Men stand to gain by copulating with any available woman. Sex is something that women have that men want. Sexual pleasure Men generally are thought to have more sexual pleasure than women. The more pleasure a woman has, the weaker her bargining position. This does not make any difference in sexual economics as women have less drive but the capacity for multiple orgasms.
Men have more drive but less stamina.
Visual arousal Men are aroused by pictures and sights of women - as discussed before. Abstinence Men find this hard but women don't. This is why only men use prostitutes. Desire for variety Because men constantly desire variety, women are seen as a commodity that is in short supply. Sexual transaction Most men are attracted to most women but this is not true the other way round.