Many virgins will testify that being a virgin "sucks"; another thing that sucks is a vacuum. It is therefore no coincidence that, much like a vacuum, nature abhors a virgin. Any time a character's virginity is mentioned in the course of a plot as being a negative attribute, we can be rest assured that by the end of the story the character will "get over it", and get laid. The negative attribute in question is defined very broadly. It can simply mean that they lack self-confidence, experience with women, or that they just aren't real men. If the virginity is necessary for a character to be made into a ritual sacrifice (and thus, losing it renders her unable to be sacrificed), that counts, too.