My wife was just a few pounds lighter than me, and she was 3rd degree black-belt in three different martial arts disciplines.  I once watched her stomp a mud-hole in three burly loggers.  If we got into a heated argument, she would unleash her best shots on me.  Then I would ask her if she hurt her hands, and she would go off crying, like most women do.  Besides, I was often being really "snotty" and provoking her.  "Whatcha goinna do about that?  Huh?  Huh?"  Technically, it may have been domestic violence, but we really couldn't hurt each other.  We were too evenly matched.  But that was just us.  I believe that physical violence against a measurably weaker partner should be heavily sanctioned ... and that excessive, especially mean-spirited, verbal abuse against an emotionally weaker partner, be they either male or female, should be classified as Domestic Violence also.  Note:  Both of us were 24-7-365 open carry, and never even once, thought about taking our arguments that far.