Above, a colorful poster for Fûten Rôjin nikki, aka Diary of a Mad Old Man, with Sô Yamamura as a man recovering from a stroke and Ayako Wakao as the occasionally towel-clad young daughter-in-law whose presence inflames his libido. Far better and more serious than it sounds. The movie premiered in Japan today in 1962. We have a couple more promo images below, and you can see a few more Wakao posters for a different movie here.
If only she knew what was going on in his head.