Just because Mary Kate isn't having sex, this doesn't mean that she has never touched guys before. It just means that she's not willing to throw her life away like the Spears sisters have done... and ruin all that she has worked for, by being reckless with sex. Having sex is something that actually has meaning for some women, and I don't see why it should be so shocking that Mary Kate is waiting to give up her virginity. OK, so she smokes and drinks... there's really no connection between these things and having sex, in my opinion.