I was looking for a subject heading for VIRGINS. There isn't a heading I can find for people who haven't had sex. There is, however, one for VIRGINITY, which has some interesting cross references:
BT SEXUAL ABSTINENCE
NT DEFLORATION
NT JUS PRIMAE NOCTIS, which as far as I can tell has to do with the right of the spouse/property owner to his bride's virginity, which he can take himself, or share out.
I wanted to assign a term to a zine in the Barnard collection, Ms. America, that would describe one of its authors as a virgin. I imagine that women's studies, girls studies, feminist, and cultural studies scholars might be interested in the writings of those who abstain from sex for whatever reason.
And I can only imagine religious and religion researchers wanting to have access to such materials (actually a whole different batch of materials, but materials assigned the subject heading VIRGINS nonetheless).