|Wirdou.com anthropomorphized images (Ѻ) of the three main types of chemical bonds: ionic, covalent, and metallic, shown alongside bond energy values per each type of bond.|
In human chemistry, a 'human chemical bond' is what holds 'human molecules', i.e. people, together in attached relationships.  Thermodynamically, chemical bonding is determined according to free energy interactions between molecules. This logic is explained by American-born Canadian biochemist Julie Forman-Kay as such: 
“Whether two molecules will bind is determined by the free energy change (ΔG) of the interaction, composed of both enthalpic and entropic terms.”
This logic, invariably, applies to interactions between human molecules, albeit the measurement of the enthalpic and entropic components in human-human interactions is conceptually difficult.
● History of chemical bonding theory
● Human chemical bond
1. Daintith, John. (2004). Oxford Dictionary of Chemistry. New York: Oxford University Press.
2. Thims, Libb. (2007). Human Chemistry (Volume Two) (§13: "Human Chemical Bonding", pgs. 515-560). Morrisville, NC: LuLu.
3. Forman-Kay, Julie D. (1999). “The ‘Dynamics’ in the Thermodynamics of Binding.” Nature Structure Biology, 6: 1086-87.
● Chemical bond – Wikipedia.