A childhood belief about virginity

I'm a high school student and we recently performed "A Funny Thing Happened on the Way to the Forum" for our spring musical. Any of you who know the show, you know that it has alot of "adult humor" and some double meanings...all that fun stuff. Well, My mother came to see it (I was the assistant stage manager, so she was mad that I wasn't in it this year...o well) and she brought along my 9 year old brother. After the performance, he asked my mom what a virgin was. She said it was a nickname for Virginia.

I'm now a little nervous about his reaction when he learns the truth...