I've never seen this movie, so maybe someone can explain to me what sort of life that old man's lived where he's SURPRISED and DELIGHTED to find a five year old virgin?
In the film, the protagonists had found a spell to banish a group of monsters led by Dracula back to the dimension they came from. The spell needed to be recited by a virgin female. Turns out the first girl they picked already had her cherry popped, so one of the team suggested his little sister as a backup reader.