In ordinary people, there was a rite called Fundoshi-iwai when a boy wore Fundoshi (loincloth) for the first time under heko-oya (acting parents asked for Fundoshi iwai), and was taught about sex.
民間においては褌親（へこおや）の元で、初めてふんどしを付け、性に関する知識を授かる褌祝（ふんどしいわい）と呼ばれる儀式がある。