Though Kirk and Anne’s long lasting marriage is an anomaly for Hollywood, the two did experience their fair share of hardships. In their book, they both acknowledged that Kirk had multiple affairs throughout their marriage. 

“Kirk never tried to hide his dalliances from me. As a European, I understood it was unrealistic to expect total fidelity in a marriage,” she wrote in the book. 

Kirk had also detailed his infidelities in his 1988 autobiography The Ragman’s Son. The book went on to be a bestseller.