The mutual forehead touch, or "head bonk," emerged in cyborg/robotic/posthuman communities fairly quickly as early high-degree of replacement prosthetics were unable to perform many fine motor movements usually associated with affection. Nearly all head/facial replacements lacked full facial expression motor suites; miniaturization at the time was unable to provide the level of articulation needed for everyday and intimate expressions without causing an "uncanny valley" effect. As a result, most facial expressions were presented via AR overlay, or simply left completely out (or sometimes disabled by the users) in favor of a more natural resting expression.
Because the facial motions required for kissing were usually not possible under the constraints of these systems, many cyberized individuals began to use a mutual forehead touch as a similar symbol of closeness and affection. As the gesture spread through the CRPH community, many users involved in self modification began to install NFC touch points in their foreheads, to allow data to be transmitted during a forehead touch.
this is the most autistic worldbuilding we've seen in a while and we mean that as a glowing compliment
