I have problem with WC virgins - at least those who are late teens or older. They just don't make sense to me. I've explained why in posts on the spoiler board and in a couple of posts here, so if you've read those posts this is me repeating myself. If you haven't, here's why White Court Virgins don't really make sense to me.
Looking at the vampire power structures:
The Black Court breed like undead rabbits. It literally takes only minutes to go from "Alive and well and wondering who just walked in the room" to "dead" to "Yes my master I live again for you".
The Red Court takes longer - usually (Susan didn't take that long) - but they can still rebuild their numbers in a short time.
The White Court can't build its number quickly. 18 - 19 years after you decide you need to have a new WCV around you've got this teenager and for some reason you don't make sure that nature takes its course? You don't hire a hooker and send it to your son's room as a birthday present? You don't pick out your daughter's first lover (making sure that the first time will be everything you need it to be) and ensure that it's hormones, not love, when she has her first meal?
What, you aren't a die hard schemer? Then how do you stay alive in the White Court?
In the one book where we met a White Court virgin she is central to some of her father's schemes, to the point where he turns his back on a wizard to check on her when it looks like she might be in trouble. My reading of that book was that the only reason she was still a virgin is because of that Death Curse, that her father wanted to break that curse before she transformed so he could be her second "lover" and break her (the way he had broken his other daughters).
Meanwhile, there's the echo of a hunger in the back of the White Court virgin's mind. Sometimes he/she zones and almost feeds without making a conscious decision to. Then's human nature to consider - we are drawn to emotions. Whether it's teen drive for sex or the need to comfort a scared person (these two can combine at scary movies) there's the instinct to reach out to other people. An instinct that can unleash the demon inside of a White Court virgin.
Which is a long way of saying that I can't see there being many more White Court virgins than there are knights of the cross. Maybe a few more, maybe less. Most of the ones that exist at any point in time would be mid teens or younger and I don't think they get their powers at least until adolescence, which means most White Court Virgins are effectively the same as regular kids.
Richard