Comeback (1982) - https://www.imdb.com/title/tt0083746/

https://lustycinema.li/watch/comeback

Plot - Rocco (Eric Burdon), a once-famous American rock/blues star whose career has crashed into financial ruin and severe drug addiction, travels to West Berlin in a desperate bid to launch a musical comeback. However, he discovers that his estranged wife, Tina (Julie Carmen), and his child have left him and are now living with his former lawyer (John Aprea). As Rocco navigates the ruthless demands of his predatory manager (Michael Cavanaugh) and struggles to keep his head above water, his fraught dynamic with Tina and his own self-destructive habits threaten to derail his personal and professional rebirth.

All the cheating wife moments are implied . This movie wouldhave been such hot if those cheating scenes were added.

There's one hot sex scene where 28 year old Julie Carmen showers 41 year old Eric Burdon with tongue kisses during the end of the movie ( She was married too )