(2010) Our Sexuality. Cengage Learning, გვ. 241. ISBN0495812943. ციტირების თარიღი: September 12, 2013. „Fellatio (fuh-LAY-shee-oh) is oral stimulation of the penis and scrotum.“
See here and pages 47-49 for male virginity, how gay and lesbian individuals define virginity loss, and for how the majority of researchers and heterosexuals define virginity loss/"technical virginity" by whether or not a person has engaged in vaginal sex. Laura M. Carpenter (2005). Virginity lost: An Intimate Portrait of First Sexual Experiences. NYU Press, გვ. 295 pages. ISBN0-8147-1652-0. ციტირების თარიღი: October 9, 2011.
(2010) The Marriage and Family Experience: Intimate Relationship in a Changing Society. Cengage Learning, გვ. 186. ISBN0-534-62425-1. ციტირების თარიღი: October 8, 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'.“
Joseph Gross, Michael (2003). Like a Virgin. The Advocate/Here Publishing, გვ. 44-45. 0001-8996. ციტირების თარიღი: 2011-03-13.
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Sonya S. Brady, PhD and Bonnie L. Halpern-Felsher, PhD (2007). „Adolescents' Reported Consequences of Having Oral Sex Versus Vaginal Sex“. Pediatrics. 119 (2): 229–236. doi:10.1542/peds.2006-1727. PMID17272611.CS1-ის მხარდაჭერა: მრავალი სახელი: ავტორების სია (link)
Sonya S. Brady, PhD and Bonnie L. Halpern-Felsher, PhD (2007). „Adolescents' Reported Consequences of Having Oral Sex Versus Vaginal Sex“. Pediatrics. 119 (2): 229–236. doi:10.1542/peds.2006-1727. PMID17272611.CS1-ის მხარდაჭერა: მრავალი სახელი: ავტორების სია (link)