About 25years ago, I became a girls lacrosse referee. The sport was just kicking off here in Minnesota. I was referee #4....ever. Eventually I rose to the point of doing the big college games, which was a lot of fun. I had never played the sport or seen it played, but learned the rules quickly. It's a finesse sport based upon safety. Well, that only lasts so long. The sport has gotten to be a lot more like men's lacrosse, especially after girls hockey players started making lacrosse their "offseason" sport. Helmets quickly became required and (I'm not longer involved) but I wouldn't be surprised if they wear pads soon, like the boys.
Maybe in 2006 or 2007, I was refereeing the state semi-final game. Normally any stick contact within a sphere around the head is a penalty, and contact with the head itself was a major penalty. As the game progressed, the play got more aggressive. Players were swinging intentionally at opponents heads creating contact. Those are automatic red cards, ejection from the game, and you sit out the first half of the next. By midway through the second half, at least 7-8 players from each team had been ejected. Coaches and fans were going bananas because whomever won, was going to be missing a lot of their starting players for half of the game. As the lead ref, I called multiple official's timeouts to bring captains and eventually coaches into the discussion of safety and the consequences of continuing to play rough. Nobody did a thing to control it, so we did. I eventually even stopped the game and ejected a coach from the field. The game ended with booing from just about everyone, but it's the players that ultimate control any game in any sport.
The above was the worst example of the behavior that I began to see more regularly. The viciousness displayed is hard to describe. Women play their games with different emotion than men. I'm not saying that it's right or wrong, but it will be hard for the WNBA to legislate out the way that women can treat one another in the heat of a game. It's different than a men's game, not that men are any better. The aggression is just channeled and displayed differently.