Jisho

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Noun, Suru verb, Intransitive verb, Noun which may take the genitive case particle 'no'
1. ejaculation
Wikipedia definition
2. EjaculationEjaculation is the ejection of semen (usually carrying sperm) from the male reproductory tract, and is usually accompanied by orgasm. It is usually the final stage and natural objective of male sexual stimulation, and an essential component of natural conception. In rare cases ejaculation occurs because of prostatic disease. Ejaculation may also occur spontaneously during sleep (a nocturnal emission or "wet dream"). Anejaculation is the condition of being unable to ejaculate.
Read “Ejaculation” on English Wikipedia
Read “射精” on Japanese Wikipedia
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