後こう背はい位い

noun

doggy style; rear-entry position

Refers to a sexual position where one partner enters from behind. The term is clinical or descriptive; in casual conversation, バック or 後ろから is more common.

• 後こう背はい位いは、パートナーが後うしろから挿そう入にゅうする体たい位いです。

  The rear-entry position is a sexual position where the partner enters from behind.