EXACTLY what I thought but didn't say it as eloquently!
I don't think there's anything wrong with saving your virginity until you're married. It's a personal choice and I would never judge someone for that whether or not I agree with it.
HOWEVER there is a huge difference between making a mature decision about your sexuality and being extremely infantile about it. If that's a choice one is going to make I think the individual owes it to themselves to educate themselves about sex and sexuality regardless of whether or not you are active. The 3 roommates have incredibly stunted perspectives on the act of sex and how it is defined in a relationship. The one girl who said she expected to have an orgasm on her wedding night baffled me- I knew from an early age that sex hurts the first time. I just read that these women have a blog and I couldn't even get through a single entry it made me so uncomfortable.