A rich teenager has a birthday party at the beach, and her father kills and cooks a servant there to celebrate the occasion. Lots of topless girls are running around as she roasts.

Some only come later because their parents didn't want them to see the servant being slaughtered, but only after the cooking starts.

One girl is indignant, telling everyone how wrong it is, but it excites her more than anyone; She's caught masturbating in a hidden spot, and eventually eats some too.

Some are discussing the possibility of becoming a servant of this type, and maybe be eaten themselves one day.

The father gets lucky.

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To warn them against committing crime, a school class are taken to prison to witness an execution, and possibly the convict's autopsy afterwards. At least some of them enjoy it.

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Sex education now includes instructions on snuff-sex. The teachers may not approve of teenagers doing such things, but they are doing it anyway, and should be taught how to do it right; Which means avoiding unwanted harm, or not causing a slow death when a quick one is desired, or not causing crippling non-lethal injuries when a death is desired. Videos may be shown for illustration. A few options:

General blade handling.

While cutting through the neck of a girl who is currently sucking you, make sure not to hit her brainstem, which could cause her jaws to shut.

Get tested for prions before letting someone eat you.

Severed heads can remain conscious for [certain time], treat them gently unless you have their permission to do otherwise. Remember that they weigh several kilos, enough to break your foot.

Do not leave bodies unrefrigerated for long, especially in warm and humid conditions. Here are some numbers to call for quick disposal. Make sure to clean blood, too.

Procedures on how to report a consensual(or otherwise legal) killing to the authorities.

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A rather naive girl has a crash on a manipulative one. The latter convinces her to do an amateur stage play(possibly at school) where she will chop off her head, then give it a good kiss. Manipulative girl could be replaced with attractive famous actor or musician.

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The children of criminals and other unfit parents are taken to special orphanages, where they are trained to obediently be executed in a ritualized manner, which can only be done once they're past a certain age. Several of them, whose ages are no more than a year across, are executed each time, in front of an audience, reinforcing the social order by demonstrating its strength.