Inundated with what messages?
How much is too much of anything? Are you talking about too much sex or too much education?
And, yeah, they need to change the way they are communicating the message. They need to start teaching fact and science, and leave the abstinence and morality to the parents.
I agree with you about morality and leaving that to the parents, but not on abstinence. Why someone would abstain from having sex is completely up to them (religion, beliefs, preferences, etc...) but abstinence IS a viable option that should still be taught. If you don't have sex, you can't become pregnant. That's just a fact.