Invisible Man: Grape! (1978)
A horny scientist who is married to a hot wife and lives with his virginal step sister invents a drug that can make him invisible. Erotic high jinks ensue.
Actors: Yuki Yoshizawa
Hoteru hime (1993) aka Burning Princess
A wife cheats on her pilot husband while he is out flying planes. She screws her lover while wearing her husband’s pilot hat and comes to a swinging party with him.