As a devoted, probably even little radical Christian believer, and much much more older then most of the people here, I say that it shouldn't be important. Premartial sex was never a big sin in Christianity.
  
   "Though your sins are like scarlet, I will make them as white as snow. "
    
   Just don't do it with everyone and anyone, be careful about your personal higiene, and don't enter in sexual intercourses to young.