The parent doesn't have the ability to limit exposure to material that they may find too mature for their child in that circumstance.
What anyone else thinks or determines is appropriate to a child really doesn't apply. The only thing that matters is what the parent determines is appropriate. (insert reasonable person clause here)
Indeed. And so how is ANY of this the guy's problem? He is simply sitting there, minding his own business, passing the time on an airplane by reading a magazine. He's not rubbing his crotch, or holding the centerfold up. To imply that the only reason he is reading the magazine is for the thrill of doing so in front of a 14 year old is silly; how in the world would he even know he'd be near a 14-year old that day. To the contrary, when I travel on business, I expect, hope and pray to that my plane will be an adult environment. And if you are offended by public displays of affection, you'd better avoid airports. People are constantly hugging, kissing and carrying on. You'd probably do well to avoid intercontinental night flights as well

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Anyway, in other words, why is it the responsibility of society to conform to the strict moral code of the uptight parent of a 14-year old??? If the parent wants the kid shielded from the world, the parent ought to cloister the kid, not expect the world to become a monastary.