I find the idea silly. What if you wait all that time, miss out on all the fun, and get married, and then you two aren’t sexually compatible? He’s a sadist and she’s a prude? That’s bound to cause problems later on.
To those who wait for religious reasons: you’re dumb. Quit letting yourself be brainwaished and think for yourself. (Deny it all you want, but that’s what’s happening.)
So, ASIDE from the fact that some fictional book might tell you pre-marital sex is wrong, why do people wait for marriage?
Edit: I come from a corner of the internet where what I’ve said above is LESS than mild. Don’t get your panties in a bunch 
Also, people crack sex up to be sacred and special and only meant for one person. I just can’t grasp this mindset. I think it can be done both for fun and for love. Nothing wrong with exploring, a one night stand, if you use protection. Psychologically, we lose our innocence long before we have sex, so I don’t see the significance.
Metalhead, sex is indeed an instinct. But that means nothing. Seeking water when we are thirsty is also an instinct. Why have we any reason to suppress instincts? they exist for a reason. And while humanity has come a long from living in nomadic tribes where people randomly had sex, is repressing your nature for years really necessary? Why would someone ever request their partner to prove their love so cruelly?
Ah, perhaps I simply lack a rampant fear of STIs and pregnancy. Considering all the precautions I take, the chance of either happening to me is maybe .0001%. I guess that’s a chance I’m willing to take 
