Sex before marriage.

So many of you other woman out here constantly post "no sex until married" but you can't be serious right? I'm sure most of you lost your virginity before marriage as majority of people on here state they have! 
Why do you believe it is so wrong to have sex before you're married? I've been in a relationship with one person ever for 7 years and we aren't married. I don't understand how a piece of paper should change that! 
Just want explanations - it really intrigues me so don't hold back with answers!

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