I think it's wrong, wrong, wrong, immoral, and wrong.
As someone that has performed over 700 marriages - I hope each and every person I have married has had sex with the person that they marry. (except the couples in their 90's - I'm not sure if they were having sex.)
It distorts the purpose of marriage from pledging your life loving, honoring, and cherishing someone and making a family together - to just getting permission to have sex. Marriage is so much more than just having sex, or at least it should be. Sex should be part of a great marriage, just like laughter and enjoying gaming together.
I grew up with that myth, that people shouldn't have sex until they are married, and I think it's a horrible injustice people press on children. I'm not saying go have reckless crazy sex - but responsible sex is part of growing up and knowing what kind of partner you would be and what you want. Like going to a movie, a restaurant or traveling to another country - it broaden your horizons and makes you a more full aware person. (And yes, people die and get weird diseases from those too.)
So, no, I do not think people should wait until marriage to have sex. No not at all.