9192294602 But the big story is the increase in anal sex . 10 percent of boys say they've had vaginal sex. . I figured that most women who reported having .Yes, Virginia, teens are having anal sex. British researchers conducted a longitudinal study (a study that follows people over time) that asked U.K. teens about their .Equality At Last: Teen Boys and Girls Have Similar Views on Sex and Porn. . the females in the study were more experienced than the boys in oral, anal, and vaginal sex.