See 272 and page 301 for two different definitions of outercourse (first of the pages for no-penetration definition; second of the pages for no-penile-penetration definition). Rosenthal, Martha (2012). Human Sexuality: From Cells to Society, 1st ed. Cengage Learning. σελίδες 576 pages. ISBN978-0618755714. Ανακτήθηκε στις 17 Σεπτεμβρίου 2012.
Judith LaRosa, Helaine Bader, Susan Garfield (2009). New Dimensions In Women's Health. Jones & Bartlett Learning. σελ. 91. ISBN978-0763765927. Ανακτήθηκε στις 31 Αυγούστου 2013.CS1 maint: Uses authors parameter (link)
See here onwards and pages 47-49 for views on what constitutes virginity loss and therefore sexual intercourse or other sexual activity; source discusses how gay and lesbian individuals define virginity loss, and how the majority of researchers and heterosexuals define virginity loss/"technical virginity" by whether or not a person has engaged in penile-vaginal sex. Laura M. Carpenter (2005). Virginity lost: an intimate portrait of first sexual experiences. NYU Press. σελίδες 295 pages. ISBN978-0-8147-1652-6. Ανακτήθηκε στις 9 Οκτωβρίου 2011.
See here onwards and pages 47-49 for views on what constitutes virginity loss and therefore sexual intercourse or other sexual activity; source discusses how gay and lesbian individuals define virginity loss, and how the majority of researchers and heterosexuals define virginity loss/"technical virginity" by whether or not a person has engaged in penile-vaginal sex. Laura M. Carpenter (2005). Virginity lost: an intimate portrait of first sexual experiences. NYU Press. σελίδες 295 pages. ISBN978-0-8147-1652-6. Ανακτήθηκε στις 9 Οκτωβρίου 2011.
Joseph Gross, Michael (2003). Like a Virgin. The Advocate/Here Publishing. σελίδες 44–45. 0001-8996. Ανακτήθηκε στις 12 Μαρτίου 2011.
See here onwards and pages 47-49 for views on what constitutes virginity loss and therefore sexual intercourse or other sexual activity; source discusses how gay and lesbian individuals define virginity loss, and how the majority of researchers and heterosexuals define virginity loss/"technical virginity" by whether or not a person has engaged in penile-vaginal sex. Laura M. Carpenter (2005). Virginity lost: an intimate portrait of first sexual experiences. NYU Press. σελίδες 295 pages. ISBN978-0-8147-1652-6. Ανακτήθηκε στις 9 Οκτωβρίου 2011.
Joseph Gross, Michael (2003). Like a Virgin. The Advocate/Here Publishing. σελίδες 44–45. 0001-8996. Ανακτήθηκε στις 12 Μαρτίου 2011.