Only the most disciplined women stay virgins until they're married.
Personally I believe they should be, but I'm old school.
It's a personal choice for people to remain that way, and a choice for someone to accept the status of a persons virginity upon marriage.
In this day and age, you would be challenged to find anyone who is still a virgin at marriage.
Society has changed, and the importance and stigma attached to the notion is well obsolete.