Deer are social creatures. They lick each other, groom each other, play with each other, run across a field to greet another, and spar with each other. I think it's the equivalent to a couple of teenage boys wrestling in the living room after a summer baseball game. They aren't fighting over a cheerleader but they might look like they are. I keep cameras on scrapes year round. Deer check and leave scent at these spots every month of the year. Their social network goes way beyond breeding and includes many different aspects.