Personally, I hope that with proper parenting and instilling morals in my children, I'll never have to face this problem.

There are two ways to look at this issue though:
If I don't allow her to get birth control and my daughter is quite rebellious (yes, it can happen to anyone), there's a chance for her to get pregnant.

But, if I allow her to get birth control, it might be encouraging her to have pre-marital sex.

Much of the time, if you raise your child right with proper morals, you shouldn't have a problem. Still, when a man and woman get together and romance takes over, sometimes it can be extremely hard for a woman to resist the temptation.