Is emission of semen the only sign of puberty?

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He studies in a mixed school in a foreign country and is asking about attending “sex education” classes
Is it possible to send someone else to do Hajj on behalf of the deceased instead of his son?

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Related Answers:
He fasted before he reached puberty and he forgot to make up some days. Can he make them up after reaching puberty?
What is the appropriate age to teach children sex education?
Conditions of Hajj being obligatory
He studies in a mixed school in a foreign country and is asking about attending “sex education” classes
Is it possible to send someone else to do Hajj on behalf of the deceased instead of his son?

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