The Christian ideal is kids who abstain from sex until they are married. To protect this ideal, they will restrict birth control, emergency contraception, abortions as well as vaccines that will prevent cervical cancer to minors.
It assumes that fear is what keeps these kids in line. Without the fear of pregnancy or a nasty disease, kids are just so horny, they will screw anything that moves. Take away that fear of repurcussions, and boy, you are just begging for spiritual and moral decay.
How Christians try and make this `secular' is by not banning it altogether (though they are trying by golly!) but asking for parental consent. That way, the Godless can deliver their spawn to the devil by consenting to abortion, where as the Good Christians can prevent it.
Does the fear of getting pregnant/STDs keep some kids in line? Can it if their boyfriends can pick up some condoms which can also prevent repurcussions? What is the use of abstinence, if you can be raped?
It has never been about sexuality. It has always been about control. Parents are just using Christianity as a defence. The truth is, a child's sexuality is frightening. A child's adoloscence is frightening. You were once the center of your kid's universe. He did most of what you said. You could scare him by withholding love, or threatening punishment. When your child is a teenager, you are not what she/he wants. His/her friends and their opinions are more important. You see how important other influences are on him. You see yourself slowly fading into the sidelines, and you hate it.
You can either accept it as a part of their growing up, trust that you taught them good judgment and let go. Or you can try and hold on tighter. Since you cannot lock them up in a cage like some Samoan tribes, until their marriage, you use law, you use the govenment, you use religion to support your endeavors.
The difference between a Liberal and a Conservative, is that the Liberal recognizes that you may have a different opinion. A conservative just thinks you are wrong. A conservative wants to retain that control over everything and he does it by taking away choices.
(However, if you do err, please note that Christ forgives all who beg for repentence with a sincere heart. Only Christians don't.)