Our bodies were designed to work together for copulation.

You don't have to have anything to do with each other beyond that.

You also can't assume that because we biologically "fit" together for copulation, that sociologically we do, that behaviorally we do, that emotionally we do, or that spiritually we do. That's a false assumption.

Or that if we ever did, it was baked into stone and not dynamic. Even that biological fit for copulation is dynamic and will evolve, and not necessarily toward betterment of the species.