Books on male vs female sexuality?

Hey folks, I want to find books on the fundamental differences between male and female sexuality (can be related to biology/socialization, etc). Does anyone have good book recommendations on this?

For context, I am a woman grappling with a pretty common situation. I only have eyes for my male partner but he is attracted to other people. After talking to some other girlfriends, it seems that this is a common situation for a monogamous heterosexual couple to be in but that the man often doesn’t have frank conversations about this.

My partner doesn’t want to have sex with other people or anything and is highly committed to me, but when he sees hot people, he feels attraction sometimes. He actively does not follow those thoughts in his mind but they come up somewhat regularly whereas when I am in a sexually committed relationship, these thoughts don’t even really enter my mind.

I only know about this difference in experience because we’ve had conversations recently (not because he stares at women when we’re together or flirts with others) and it’s been surprising just how different our sexual experiences are, even though we are both so committed to the relationship. I want to learn more about where this differences comes from and be armed with facts to help me sort this out and understand this.