It is an evolutionary concept, that over the years has been repeatedly tested dating website for under 30 proven at parties, bars, clubs, etc.
Females tend to prefer males who have already been chosen by other females of their species.
Pre-selection, though possibly wrong, is often the woman’s best indicator of a man’s S&R value.
Thus, natural selection has made sure that this observance is pre-wired into the female brain.
Similarly, Uller and Johansson (2002) report that women found men who were wearing a wedding ring to be more attractive.
Attempts to lure men away from partners are perceived as less effective when men are in committed relationships (Schmitt and Buss, 2001).