text: Using protection doesn't always work so first off, take him/her to a nursery (maybe a church nursery so she can help out) and have babysit actually babies.  Let him/her see what it's like to be a young mom/dad.  Also show him/her pictures of what STD's can do to you and educate him/her on it.  Then try the religious route.  Yes, if you ask for forgiveness, and are sincere, you'll be forgiven but what if, Heaven forbid, you got hit by a car and passed on before you could ask God to forgive you?  Do you want to spend eternity in Hell for having sex?!?\nIf none of that works, lock him/her in his/her room until he/she is eighteen.