Chivalry and religion were mutually influenced during the period of the Crusades. The early

of people's attempts to work out the most mutually beneficial ways of living and working

This is a mutually-beneficial relationship.

prompted by ever increasing encounters between peoples who lived very different and mutually unfamiliar lives,

This is a mutually-beneficial relationship.

But in the cases that have just been highlighted, it's mutually assured destruction.

Is our growth mutually beneficial and not at the expense of one another?

Finding ways to mutually satisfy each other's desires.

Even so, we can never neatly separate out science from religion: they mutually affect

Let's find an arrangement that's mutually beneficial.