The Solution: Spend some time discussing sex with your teen so that he or she understands why God wants teens to wait until marriage.
Also, try to meet the other couples so that you can feel more comfortable about your teen associating with him or her.
While all of these rules are appropriate, it will be easier for your teen to follow your rules if they understand where the rules come from.
Don't just cite Scripture -- explain how it applies.
Pros: The Bible says Christians should be yoked to fellow believers.
If a teen is dating another Christian, there is a greater likelihood that they will remain abstinent and supportive of one another.
Cons: Not all teens mature at the same rate, so even though your teen comes to that age, he or she may still not be able to handle it.