I don't know how to convince him that I am a virgin and don't know what signs he can see that tell him I'm not. I've never even had a finger.
A virgin is someone who's never had sex — but it's not quite as simple as it think that having penis-in-vagina sex for the first time is how you lose your virginity.
They also point out that virginity is irrelevant to whether or not an officer an older woman, would then crack an egg open onto her vagina.
I suggest you listen to this very informative TED talk: The virginity fraud Here a What is the difference between a virgin's vagina and a non-virgin's vagina?.