vaginal intercourse; vaginal sex
Clinical or formal term for penile-vaginal intercourse. In everyday conversation, more common expressions like セックス or 性交 are used.
Vaginal intercourse is an act that can lead to pregnancy.
The doctor answered questions about vaginal intercourse.
Compound of 膣 (ちつ, 'vagina') and 性交 (せいこう, 'sexual intercourse').