Neighbor sex courses

Back from school, he was a boy reported to his father that day they received lectures on sex.
"Then what study to you?" asked the father.
"First of all, who lectures is the Reverend Father, who explained to us about 'Why' we can not do it," said Richard.
"And ..?" asked the father.
"Then the second Mr. Doctor, who explained to us 'How' we can not do it," says Richard.
"So?"
"And the last is Mr. Principal, who explained to us, 'Where' we should not do.

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