I was aware of the Duluth Model in theory, and heard that it had influenced arresting practices and the level of charges, but I didn't know there were blatantly sexist laws differentiating between men and women: http://www.ncga.state.nc.us/enactedlegislation/statutes/html/bysection/chapter_14/gs_14-33.html

§ 14-33. Misdemeanor assaults, batteries, and affrays, simple and aggravated; punishments.

(a) Any person who commits a simple assault or a simple assault and battery or participates in a simple affray is guilty of a Class 2 misdemeanor.

...

(c) Unless the conduct is covered under some other provision of law providing greater punishment, any person who commits any assault, assault and battery, or affray is guilty of a Class A1 misdemeanor if, in the course of the assault, assault and battery, or affray, he or she:

(1) Inflicts serious injury upon another person or uses a deadly weapon;

(2) Assaults a female, he being a male person at least 18 years of age;

Based on this, an equal fight between a hetero couple would lead to a 14-33A charge against the female, and a 14-33C for the male.