His or Hers Jealousy? New Explanation for Sex Differences
When South Carolina Governor Mark Sanford was caught red-handed returning from a tryst with his Argentine mistress last June, he told the Associated Press that he had met his “soul mate.” His choice of words seemed to suggest that having a deep emotional and spiritual connection with Maria Belen Chapur somehow made his sexual infidelity to his wife Jenny Sanford less tawdry.
What the two-timing governor didn’t understand is that most women view emotional infidelity as worse, not better, than sexual betrayal. This may explain why Hillary Clinton stayed with Bill Clinton and seemed unconcerned about his sexual affair with Monica Lewinsky. Research has documented that most men become much more jealous about sexual infidelity than they do about emotional infidelity. Women are the opposite, and this is true all over the world. The prevailing theory is that the difference has evolutionary origins: Men learned over eons to be hyper-vigilant about sex because they can never be absolutely certain they are the father of a child, while women are much more concerned about having a partner who is committed to raising a family.
It is a very common observation by many that; 
Eighty different dream diaries from students attending a course on sleep and dreams where collected from 1997 to 2007, with each diary consisting at least 20 dream reports (2400 dreams). The dreams were then coded. The codes include: food sharing, potential mate, competition, wedding, shopping, pregnancy, male bonding, multiple self-representation, religion/philosophy, and wild vs. pet animal dreams. Also, each dream was categorized as recognizable or anonymous. Wherein, recognizable dreams included either family or friends, while anonymous dreams included strangers.
It is well known that genes located at the major histocompatibility complex (MHC) have a strong influence on human mate choices. The MHC is the densest part of the human genome and plays significant role in the auto immune system of humans. In order to improve the immunity capabilities, the MHC is believed to affect the mate choices, looking out for more a more different/diverse genetic partner, as this brings more new auto immune capabilities to their offspring. However this affect has not been analyzed across different sexes and for different relationship contexts.
Many studies have shown increased mating success with increased physical attractiveness, however this cannot lead to a conclusion that higher physical attractiveness would result in more number of kids. For example, several researchers have shown that when people seek partners to have kids, they do not prefer extremely attractive partners; as such partners are more likely to leave them or have extra marital affairs. This factor shows that, it is not necessary that increased attractiveness leads to more number of kids.
Animals are known to use conspicuous visual signals too allure prey or deter predators. Using colors, glossiness, ornaments are some of the well known visual signals. Sometimes the colors are used to advertise to the predators about unpalatability or harmfulness. These signals may have a cost, for example metabolic expenditure and generating the color pigment. Visual signals used to attract prey could also land up attracting predators and thus involves a trade off based on the situation.
As a part of their various experiments a group of researchers from UK noticed that, newly caught and handled birds tend to immediately bath in fresh water following the release into a cage. This observation prompted to believe that the bathing followed by preening was done to repair the feathers disrupted by the catching and handling. However proving that would be impossible, as analyzing the feather after the bathing and preening would again disrupt the repaired feathers. So, they tested to see the direct influence of bathing on the flight performance.
Kama Sutra – the Indian text dating back to 2nd or 3rd century is one of the most well known oldest “erotic arts”. Pornography – as called today, on becoming popular was banned by various laws until Supreme Court began limiting the censorship only to hard-core pornography (in 1950s and 1960s). Pornography had its first and major win following the release of the film Deep Throat and the controversy after it, resulting in First Amendment protections for porn. Since then pornography has been sky rocketing to become a multi billion dollar industry.
Breast size, body fat, waist-to-hip ratio (WHR), symmetry, volume-to-height ratio, foot size are some of the factors which have been studied for their impact on attractiveness. However very few studies analyzed these factors in relation, as most studies analyzed just one factor at a time. Of the very few studies which analyzed these factors in relationship, a researcher proposed that men could use women’s WHR as a ‘wide first-pass filter,’ screening out those women who may be unhealthy, have low reproductive capability, or be pregnant. However, a different group of researchers found no evidence for such a role. Researchers also found that the minimum acceptable levels for a number of factors increased with the length of relationship sought, but each factor was different in the way it increased and was different for each sex.
