Cooper played heroic cowboys and espoused all-American values while the studio system helped hide his offscreen affairs:
Cooper became a hero to many, even as he developed a reputation as one of the most notorious philanderers in Hollywood. He had stiff competition — Clark Gable, Spencer Tracy, the list goes on — but Cooper may or may not have slept with EVERY. SINGLE. CO-STAR. No matter his age, no matter their age, he was insatiable, before and during his marriage. How to reconcile his moral righteousness onscreen with his philandering offscreen? That was the work of Fixers, gossip magazines, and the studio system at large, which ensured that Cooper was never caught, never denounced, and held up as a paragon of American values. Of course, the way he looked in pants didn’t hurt.
“Scandals of Classic Hollywood: That Divine Gary Cooper.” — Anne Helen Petersen, The Hairpin