I would question the value of virginity, and how much future husbands or anyone else really values it. Yeah, it might be novel to take someone's virginity, and someone who is really religious might expect it to be intact, but most men, if anything, view a woman with her virginity intact as more of a "hard case" (harder to have sex with, and you have to start from scratch with this person, they have no experience) vs. someone without it. I dumped someone partially because she was a virgin, and I knew I had a long road to go down vs. having sex right now.
Parents stress with daughters on a date because daughters are:
A) more vulnerable, less likely to be able to protect themselves, which could lead to date rape
B) If said daughter gets pregnant, guess who is on the hook? Yeah, the BF is also technically financially responsible, but try enforcing that against some 16 year old kid without a job, or some college student who hasn't even seen life yet. So the parents are looking at economic loss in the short run, with a lot of family disruption as well and a pretty huge life event that will pretty much kill their daughter's chance at college or a career.
So Moms and Dads out there -- get your daughter some birth control! Same goes for your son!