family supervision, usually in a public place. Online dating systems use websites or mobile phone apps to connect possible romantic or sexual partners. 128 In a twelve-month period, the average number of dates that a single person will have is four. Archived from the original on October 18, 2006. For many of us, the requisite vulnerability and exposure that comes from being really intimate with someone in a committed sense is kind of threatening. New Berkeley research shows that online daters like each other more before they actually meet in personit's that first face-to-face where things slide downhill, and average daters report disappointment across the board, let down on everything from looks to personality. The western practice of dating is clearly out, and according to Islamic tradition, a Muslim can only marry another Muslim. 91 Chinese women expect to be taken care of ( zhaogu ) by men like a baby girl is doted on by an attentive and admiring father. 45 Online dating patterns suggest that men are more likely to initiate online exchanges ( over 75) and extrapolate that men are less "choosy seek younger women, and "cast a wide net". 128 One poll in 2009 of 3,000 couples suggested that the average duration of their courtship period, between first meeting to the acceptance of a marriage proposal, was three years. Evaluation edit One of the main purposes of dating is for two or more people to evaluate one another's suitability as a long term companion or spouse. Neurobiologist Robert Sapolsky constructed a reproductive spectrum with opposite poles being tournament species, in which males compete fiercely for reproductive privileges with females, and pair bond arrangements, in which a male and female will bond for life.