Boys will be boys. 
Proverbs on a similar topic
- Forbidden fruit is sweet.
- Am I my brother's keeper?
- Honour to whom honour is due.
- An open door may tempt a saint.
- He that has a great nose thinks everybody is speaking of it.
- He that makes himself a sheep shall be eaten by the wolf.
- He that makes himself an ass, must not take it ill, if men ride him.
- When God will punish, he will first take away the understanding.
- Rub a galled horse on the back and he will wince.
Related proverbs
Similar proverbs in the same language
English
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Youth will have its course.
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Youth will have its swing.
Similar proverbs in another language
Latin
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Iuventus, ventus.
Youth, the wind.
French
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Il faut que jeunesse se passe.
Youth is the key.
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Jeunesse est forte à passer.
Jeunesse is a strong force to be reckoned with.
German
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Jugend hat keine Tugend.
Youth has no virtue.
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Jugend will sich austoben.
Youth wants to let off steam.
Czech
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Pivo mladé čep vyráží.
Young beer on tap is coming out.
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Každé pachole plno svévole.
Every pachole full of arbitrariness.
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Mladost — nerozum.
Youth - unreason.