性せい行こう為い

せ

い

こ

う

い

Freq.FrequencyTop 20,000

Meanings

1

noun

Formal, clinical term for sexual intercourse or sexual activity. Used in medical, legal, or educational contexts.

性せい行こう為いについて正ただしい知ち識しきを持もつことが大たい切せつだ。
It is important to have accurate knowledge about sexual intercourse.
この法ほう律

りつ

で

は

、

同どう

意い

の

ない

性せい

行こう

為い

は

犯はん

罪ざい

と

みなさ

れる

。

Under this law, non-consensual sexual acts are considered a crime.

セックス
Common, casual loanword for sex. 性行為 is more formal and clinical.
性せい交こう
Also a formal term for sexual intercourse, often used in medical or legal contexts. 性行為 is slightly broader, encompassing various sexual acts.

Compound of 性 (sei, 'sex, gender') and 行為 (kōi, 'act, deed'). A straightforward Sino-Japanese formation.