Pleasures of the Aged, No. 7 from the book Elegant Erotic Mane'emon (Fūryū enshoku Mane'emon), vol. 1

Mane'emon notes a poor old farmer suffering from an enlarged scrotum isn't deterred from kissing his wife when he is inspired by the sound of his son and daughter-in-law's passions behind a mosquito net in the next room.