Holy crap... please tell me people dont do this... I am older but that would have been a fucking stupid idea even for people from my era... I dont have the words to describe how idiotic that would be after having now experienced a fair whack of life and watched marriages fail left and right (including my own).
religious beliefs aside (not going there), sex is incredibly important to a long term relationship and there is no possible way you should be playing russian roulette by getting married first...
apologies if i am ranting.