Virginity
Virginity was the state of never having had  before.

Tom Paris lost his virginity in his bedroom when he was seventeen, while his parents were away for the weekend. When he told The Doctor this, the hologram said he'd note it in Paris' medical file. ()

 deliberately refrained from having sex since he was a member of the Hysperian Royal Family, and by Hysperian Law, if he were to lose his virginity, he would be forced to resign from Starfleet and become the king of Hysperia. ()

See also
 Mary
 Virgo

External link

Physiology
Sex and reproduction