Jone and Elena met at their friend’s party; it was love at first site. The chemistry between them was so strong, that it could destroy the entire place. They got married a while later, and now they have four lovely children. Unfortunately, the couple doesn't enjoy their marriage anymore. Last Sunday, Jone betrayed his wife by sharing his bed with another woman; Elena betrayed him too. Why has their unconditional love ended? Many lovers undergo three stages of love; lust, attraction, and attachment. Humans’ psychological and biological makeup does not help them to sustain long term relationships. When it comes to choosing a potential mate, men and women are essentially guided by their sexual desire. This feeling of lust, “has more to do with hormones like testosterone, which, when given to men and women, increase sex drive and sexual fantasies,” (Sinha). In fact, men and women have different approaches to this stage of love. Several studies show that females are more selective in picking males, because they need an older and mature partner, that is capable of bringing social resources to the table. However, a women’s physical attractiveness is weighed more heavily by men, because it is a good indicator of desirable genes. In order to determine if a female is capable of procreating a healthy progeny, men evaluate many details in her body. For instance, they prefer women with symmetrical facial features, shiny hair, and sparkling eyes. Even more, a, “waist-to-hip ratio of 0.7,” is a crucial indicator of a woman’s fertility, (Cronin). While a simple look at the woman’s body is enough for a man to pick a potential mate, a woman needs more time to size up the man’s finances and social status. Hence, sexual intercourse is not her first priority. This fact explains why, “twice as many males as females committed adultery,” (Pringle). Moreover, a study of American college students showed that 50% of both men and women