The men that ONLY stuck with one woman (even a high quality woman) were losing genetically to the men that used all of their opportunities and had many more children that survived. Those children were carrying their fathers promiscuous genes, and this is why those male genes were passed to us. By Nature men are made to seek as much sex as they can get, so they can spread their seed wider. By Nature women are made to seek as many admirers as they can get, so they can make a better choice and get the best seed. Men seek quantity - women seek quality. This is why men seek sex and women seek love. Love is the proof that a woman needs to have some assurance that theman will stick around and help her with the upbringing of the offspring. For a woman, sex is the culmination of her emotional commitment to a man. For a man, sex is a physical act that eases the testosterone pressure he experiences constantly. Only after this tension has gone, can a man feel love towards a woman. This is why it often happens that men disappear after they got what they wanted: it wasnt love; it was the testosterone pressure. Sex for men is the reality check of their passion. This is why having sex early in the relationship is hazardous for women: the man has not had the time to develop any romantic feelings for her. He needs time to develop those feelings, and the only way to do it is through keeping the sexual tension going for as long as practicable. Sex must be attainable, nearly possible - but not quite. When the sexual tension is at its peak, its release is mind-blowing and once is never enough, which lays a proper foundation for a future relationship and love. Men fall in love through sex; women fall in sex through love. All of this happens on the unconscious level - we do NOT realize whats going on. But the reason why you are here today and alive is because each and every of your ancestors, men and women, acted true to their instincts and managed to attract at least one sexual partner and produce an offspring. So, there is no need to be bitter about men wanting sex and women wanting love. Those two are the necessary pieces of the puzzle called Survival Of The Species. And youll be better off understanding what the other gender is going through and giving them exactly what they want: a mind-blowing sex or exhilarating love.