It's about underlying misogyny and power dynamics. They don't cheat because they want an open relationship.

These types of men feel fundamentally entitled to women (and often the world). They want power over women, not to be equal partners. Add in a dose of sexism, and you tend to get these types of attitudes about infidelity. It's not always a matter of being consciously aware of what you are doing and why. Some cheaters of this type don't even realize they harbor sexist thoughts (instead of red pills, they may be white knights).

Frankly, it can happen with anyone, not just cishet men. People have even done PhD dissertations on this topic.