This belief is especially common among teenagers. In a study of twelve- to fifteen-year-olds, one in six reported having tried oral sex, and many of these denied ever having vaginal intercourse. A more recent study from the National Center for Health Statistics found that more than fifty per cent of the fifteen- to nineteen-year-olds surveyed had engaged in some form of oral sex giving, receiving or both. Not surprisingly, alcohol and drug use increase the likelihood that a teenager will try oral sex. Like your daughter, some adolescent girls who practice oral sex consider themselves to be virgins or sexually abstinent. As a matter of fact, healthcare providers and counsellors who are attempting to obtain an accurate sexual history from teenagers must routinely ask not only "Are you sexually active?