Japanese vocabulary word of the day that I really didn't want to learn

やり部屋 (yaribeya)

(n.) Semiprivate room in a swingers' bar where option C¹ can be exercised. (Lit. "doing room")

Seen in "Shopping diva screws up courage for a public screwing", which of course is a story in the WaiWai section of the Mainichi Daily News.

¹ Making the beast with two backs — from an episode of Excel Saga that parodies dating video games.