cause what if you knock the chick up and she starts having some serious problems, like goes into some kinda still-born shock or some shit. plus if shes preggo shes going to need more food, be slower, be more emotional and hard to deal with. if anything you should be more cautious, lol. i can see if you knew FOR SURE you were going to die, then fuck it, but if not, then its worth not knocking her up