A concept originating in Japan, whereas social interactions and dealings were considered more intimate and relaxed when they took place within a communal "onsen", or public bath.
This concept is still in some practice today, as when a business agent will meet a potential client for dinner, or drinks, or on a racquetball court.
It has also evolved to define a situation of intimacy derived from the touch of skin, or close proximity thereof, as in a mother and child bonding from birth.
In Korea, as well as some other places, it has come to also mean sexual contact, heavy petting, and related activities.
In proper dealings within the corporate hierarchy, a certain level of skinship can help to make everyone feel equally comfortable.
I think skinship is gross!