Extroverts seem to differ from introverts in the physical properties they look for in their partners. One of my colleagues showed photographs of 50 different girls to male subjects, asking them to rate these for sex appeal. The girls varied from busty, nude Playboy models to fully dressed, pale, and thin English-rose types. Extroverts tended to prefer the B.B.B. types (trig breasts and buttocks), but introverts tended to feel overwhelmed by all this flesh and to prefer the less busty and more fully dressed girls. No similar study seems to have been done that would allow the girls to express their tastes in men. One might expect similar preferences of the extroverted girls for beefcake males, and of introverted girls for more cerebral types.
--from "Introverts, Extroverts, and Sex" by Hans Eysenck, January 1971.