Virginity is not a simple binary state but admits graded categories

Evidence

The first sexual question asked on the Secret Survey has always been “Are you a virgin?” While I was taught, from an early age, that this was a yes-orno proposition, I have given my students six possible answers: Yes, but I have engaged in advanced sex acts (for example, oral-genital sex) as a way of having “sexual relations” without having intercourse. — Bob Altemeyer, The Authoritarian Specter, 2214