When a man and two women eat, are they next to each other or the person sitting next to them?

Of course, it is close to sitting next to you, almost "zero distance", you can knock at the door at any time, shake hands, touch each other's back and hair, eat each other's food, bold young couples even kiss ... None of the above things have been done face to face, separated by a table, indicating that the current "distance" between the two sides is still in the observation period or nothing.