Mayaku baishun jīmen kyōfu no niku jigoku 1972

Description from zjw0601 from dextorskos.com:

麻薬売春Gメン 恐怖の肉地獄 1972
One of the many movies following the success of the Gメン (G-men) series. This one is among the numerous softcore erotic ones during that era of Japanese movie, revolving, like many others, around drug-trafficking and prostitution. This scene's a treasure find for me, since I stumbled across the movie when I was searching for the original Gメン series. And what do you know? An almost 4.5/5 scene with a 5/5 eyeroll. The scene could've been a legendary one if only the actress gave some vocal protests, hence the minus 0.5. Still, this scene is one of my biggest finds last year.