A surprising new study published in The New England Journal Of Medicine this week has revealed that human beings only use 10 percent of their genitalia at any given time. 'To think of all that we could accomplish if we just unlocked the remaining 90 percent,' said Dr. Howard Schwartz, who contributed to the sex-organ capacity study. 'Why, the back shaft alone could represent a vast reservoir of untapped potential. It's frightening, but we, as a species, have barely scratched the surface of our genitals.' Schwartz maintained, however, that with enough time and late-night exploration, human beings could someday live up to 'the promise of their junk.' 