Sshhh, no questions, only Salandrin.
OnT it depends on the region (No shit heh) and the environment of which the children, or rather teenagers, grow up in.
But yes, i'd say most parents would be alarmed at the frequency and intensity that teenagers pursue sexual interests; If they're successful or not is another question entirely.
When i have kids?
I'll make sure they use protection, i can only dream of the day my future son brings a girl home; Only for me to bust the door down wearing a cape screaming "CO- DAD BLOCKED".