
It has been studied that every time a person orgasms with another there is a dopamine response that solidifies feelings toward them. A natural extension of this is why it is usually tricky to have a purely FWB relationship with another.
They are different extremes of the same feeling. Primal and intellectual elements of attraction. True love is a unison of both at their best. To have only one or the other can still be considered but it will never be as good as both in harmony.
If the two aren't lusting after each other I'd question how attracted they actually are to each other in the first place.
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