May I just contribute to this discussion by suggesting that the boarders at Cheltenham Ladies display the best whore qualities I have seen in any non-state school ladies. They most certainly are not virginal. They boast a wealth of experience with the male community.
These girls are reputed for being the biggest sloshers in Gloucestershire, beating even City of London Girls to this highly coveted title. More shockingly, rumour has it, that a few year 11s at Cheltenham are proud of their titles of 'working girls'. At least for a few wealthy arabian businessmen in Pimlico.
I think the whole stigma of being a slut with girl who boards is nothing like that of a state schooler. It is as if there is a silent code amongst boarding school girls that one is expected to get involved with as many men and one deems necessary.
I don't think boarding school girls are all that inexperienced, they just seem to be more well rounded and mature than their state school counterparts. When I was at state school it required much effort to get one of the girls in my year to give me a blow job, but a frappucino from Starbucks secures some healthy oral action from a Cheltenham lady.