On the one hand:
Because virginity is often culturally linked only to vaginal
sex, to preserve virginity, adolescents and young adults
may engage in other sexual behaviors that involve exchange of fluid and are thus salient for STD acquisition. Overall, oral sex and anal sex are prevalent behaviors in this population, most commonly in conjunction with vaginal sex. Here we consider those who have oral or anal sex without vaginal sex. Amongst those who have only oral sex and/or anal sex, pledgers are over-represented. Overall, about 3% of respondents reported oral sex with one or more partners but no vaginal sex. Although just over 2% of nonpledgers fall into this group, 13% of consistent pledgers and 5% of inconsistent pledgers do (p .000). Similarly, 0.7% of nonpledgers report anal but no vaginal sex, compared with 1.2% for pledgers….
On the other hand:
§ 18.2-361. Crimes against nature; penalty.
A. If any person carnally knows in any manner any brute animal, or carnally knows any male or female person by the anus or by or with the mouth, or voluntarily submits to such carnal knowledge, he or she shall be guilty of a Class 6 felony, except as provided in subsection B.
See also: The Everything-But Girl.