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“Semenarche” in Japanese

Short answer
精通 seitsuu せーつー

Semenarche in Japanese is “精通” (seitsuu). Full meaning: being well versed (in), being well acquainted (with), being familiar (with), having a thorough knowledge (of), being an authority (on); (a boy's) first ejaculation, spermarche, semenarche.

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