A lot of new studies that have arguably done a better job of data collection seem to show that domestic violence happens just as often woman on man as it does the other way. Men tend to not report it and the ones who do usually get arrested because our "patriarchal" society always assumes men are the perpetrators.
http://ncfm.org/ncfm-home/philosophy/"FREE MEN:
From harsher treatment under law for criminal violations than the treatment accorded to women in matters of arrest, conviction and sentencing.
From the notion that as a class they oppress women any more than women as a class oppress them, or than society in general oppresses both sexes through stereotyping."