Just like we don't allow children to drive too early, or drink alcohol, they should be discouraged from risky behavior at this tender age. More than half of all women have had an abortion today. Ask any one how they feel about it when they are 30. Especially when you consider they caught a disease or caused an abortion with someone they weren't with for 6 months.
It isn't "old fashioned" or "puritan" to want to protect your children. People, for the most part, discourage drug abuse for children, but somehow accept risky sexual behavior as a natural fact.
Wisdom is more than being able to do advanced math.
For the life of me, I can't understand why Californians and northeast yankee's just don't move to Europe where they have all the sexual freedom, socialized medicine, and other crap Americans don't want. Every pedophile in the world is praying you lower the age of consent to 12 right now. The moral bigotry of the leftists don't consider the devastation they are doing to their children for the sake of libertarianism.