SIECUS Prevalence of Unprotected Anal Sex among Teens Requires New Education Strategies Accessed January 26, 2010 See here and pages 48–49 for the majority of researchers and heterosexuals defining virginity loss/"technical virginity" by whether or not a person has engaged in vaginal sex.
Vaadatud July 16, 2013.  Kontrolli kuupäeva väärtust kohas: |accessdate= (juhend) SIECUS Kaitsmata anaalseksi levimus teismeliste vahel Nõuab uusi haridusstrateegiaid Juurdepääs 26. jaanuaril 2010 See here and pages 48–49 for the majority of researchers and heterosexuals defining virginity loss/"technical virginity" by whether or not a person has engaged in vaginal sex.