Numerous studies have found associations between facial/body symmetry and a variety of perceptions, conditions and predispositions. For example, researchers have identified associations between symmetry and the perception of health, mother's facial [a]symmetry and susceptibility of offspring to autism, and asymmetry and aggression in males.
I was, however, unfamiliar with a 1995 study that found an association between male body symmetry and the number of orgasms experienced by female partners during sexual intercourse. Vaughan at Mind Hacks reports:
The study was led by biologist Randy Thornhill and recruited 86 young couples who completed a number of relationship questionnaires, including one on how often the female partner orgasmed during sex. The males then had their bodies measured and assessed for how much one side differed compared to the other - a measure of bodily asymmetry.
In the final analysis neither the male's age, wealth, social skills, physical attractiveness or relationship style predicted the frequency of female orgasm. Only male bodily symmetry was statistically associated with the chance of the women climaxing during sex.