Virgin until marriage

I'm not hating on women who choose keep their virginity until they're married. It's their life so they can to whatever make them happy.
I just don't understand how they can go such a long time of being with someone without having sex. I couldn't live for a few years with someone by having just kisses and hugs. I wouldn't wait that long for someone either to be honest. Maybe it's just me and my high as hell libido, but I just don't get it.