How to say "genitals" in Japanese

• 性器せいきCommon
  nounThe straightforward anatomical word for the genitals, usable in medical, educational, or clinical contexts when you need to refer to the actual organs without euphemism.
  「昨日きのうの今日きょうだし・・・その・・・性器せいきが痛いたかったりは？」「まだ、少すこしヒリヒリしますけど」↗

  "It's right after yesterday so ... that is ... do your genitals hurt or ...?" "It still smarts a little but..."
• あそこJLPT N5approx.Common
  nounA colloquial euphemism for the genitals or private parts, typically used in casual, tactful, or slightly embarrassed everyday conversation rather than formal or medical discussion; normally written in kana.
  先生せんせい、アソコがかゆいんです。↗

  Doctor, I've got an itch in my crotch.
• 下腹部かふくぶCommon
  nounLiterally the lower abdomen or lower belly; only by loose extension does it stand in for the private parts, so for the anatomical sense of 'genitals' it is seldom the word you want.

性器 is the neutral anatomical term; 「あそこ」 is a colloquial euphemism for casual or delicate conversation; 下腹部 literally means the lower abdomen and is only loosely, secondarily used for this sense.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

• 性器せいきgenitals
• あそこgenitals
• 下腹部かふくぶgenitals
• 局部きょくぶprivate parts
• 秘部ひぶgenitals
• 局所きょくしょprivate parts