A hormone called oxytocin, widely dubbed the love hormone, is naturally released after a 20 second hug from a partner.
The hormone triggers the brain's relaxation and trust circuits.
Researchers call oxytocin the great facilitator of life, saying it serves the continued propagation of a species
Apparently, it plays a central role in the complicated aspects of reproductive behaviour
A side note - Men need to be touched two to three times more than women to maintain the same levels of oxytocin!