Can minors dating adults
After all, a High School Hustler could hardly get anything done if the teachers kept their eyes open, and if the parents were vigilant; being told that You Are Grounded would wreck the plot.
But on a handful of drama shows, there's a real venom to it.
Or a combination of the above where the kids simply don't tell the adults so they don't know.
Parental Obliviousness and Police Are Useless are subtropes.
The problem is that the protagonists — because of youthful embarrassment, a need to prove themselves or simple ego — can't ask for help, or accept it when it's given.
See also: Teenage Wasteland, Competence Zone, Parent Ex Machina, Best Years of Your Life, Lazy Husband, Babysitter from Hell. Not to be confused with Humans Are Morons, which deals with "We shall secure the school against He-Who-Must-Not-Be-Named while you search for this — this object." "Is that possible?
This is also common when adults are told something is happening, but simply don't believe it, resulting in a Cassandra Truth.
The logical extreme of this trope is There Are No Adults.
Sexual activity with a person, who has not reached 14 years of age irrespective of the child sex and his/her voluntary participation are punished with imprisonment.
Who commits and act in order to arouse or satisfy a sexual desire without a copulation regarding a person who has not accomplished 14 years of age shall be punished for fornication by imprisonment of up to six years.
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This version is, unfortunately, often Truth in Television.