"A new study suggests that what people mean when they say they've had sex -- or haven't -- depends on whom you ask," St. Petersburg Times columnist Colette Bancroft writes in an opinion piece about new research from the Kinsey Institute for Research in Sex, Gender and Reproduction and the Rural Center for AIDS/STD Prevention. The study, published in the journal Sexual Health, examined how men and women in various age groups classify whether various physical acts constitute "having sex... 
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