“…Based on these findings, Lindberg et al [5] concluded that the onset of oral sex and vaginal sex occurs close together, because by 6 months following initiation of vaginal sex, most teens have also had oral sex. In contrast, Brewster and Tillman [6], using data from the same NSFG data collection wave, showed that virgin youth with oral sex experience were less likely to have vaginal sex, thus concluding that oral sex appears to delay the onset of vaginal sexual behavior.…”