spermarche
n.— «For this milestone in male maturation I suggest one of two terms: we might call it primus ejactulatus from the Latin or spermarche from the Greek. I prefer the latter, which means “the beginning of sperm.”» —“The Psychodynamics of Sex Education” by Gordon Shipman The Family Coordinator Jan., 1968. (source: Double-Tongued Dictionary)
Further reading
The word filibuster has a long and colorful history, going back to the days when pirates roamed the high seas. Today it refers to hijacking a piece of legislation. Plus, the language of yoga teachers: When doing a guided meditation, you may hear...