Bryan Strong, Christine DeVault, Theodore F. Cohen, The Marriage and Family Experience: Intimate Relationship in a Changing Society, Cengage Learning, 2010, p. 186, ISBN 0-534-62425-1. URL consultato l'8 ottobre 2011.
«Most people agree that we maintain virginity as long as we refrain from sexual (vaginal) intercourse. ...But occasionally we hear people speak of 'technical virginity' ... Other research, especially research looking into virginity loss, reports that 35% of virgins, defined as people who have never engaged in vaginal intercourse, have nonetheless engaged in one or more other forms of heterosexual activity (e.g. oral sex, anal sex, or mutual masturbation). ... Data indicate that 'a very significant proportion of teens ha[ve] had experience with oral sex, even if they haven't had sexual intercourse, and may think of themselves as virgins'.»
