A friend of mine posted a link to this Time magazine article that answers that question. Note that Time magazine leans far to the left. (H/T Jerry)

Excerpt: (links removed)

There is little dispute that men commit far more violent acts than women. According to FBI data on crime in the U.S., they account for some 90% of known murderers. And a study published in American Society of Criminology finds that men account for nearly 80% of all violent offenders reported in crime surveys, despite a substantial narrowing of the gap since the 1970s. But, whatever explains the higher levels of male violence—biology, culture or both—the indisputable fact is that it’s directed primarily at other males: in 2010, men were the victims in almost four out of five homicides and almost two-thirds of robberies and non-domestic aggravated assaults. Family and intimate relationships—the one area feminists often identify as a key battleground in the war on women—are also an area in which women are most likely to be violent, and not just in response to male aggression but toward children, elders, female relatives or partners, and non-violent men, according to a study published in the Journal of Family Violence.

And more:

Research showing that women are often aggressors in domestic violence has been causing controversy for almost 40 years, ever since the 1975 National Family Violence Survey by sociologists Murray Straus and Richard Gelles of the Family Research Laboratory at the University of New Hampshire found that women were just as likely as men to report hitting a spouse and men were just as likely as women to report getting hit. The researchers initially assumed that, at least in cases of mutual violence, the women were defending themselves or retaliating. But when subsequent surveys asked who struck first, it turned out that women were as likely as men to initiate violence—a finding confirmed by more than 200 studies of intimate violence. In a 2010 review essay in the journal Partner Abuse, Straus concludes that women’s motives for domestic violence are often similar to men’s, ranging from anger to coercive control.

And this is also well-known problem in same-sex relationships, especially with lesbian couples:

What about same-sex violence? The February CDC study found that, over their lifetime, 44% of lesbians had been physically assaulted by a partner (more than two-thirds of them only by women), compared to 35% of straight women, 26% of gay men, and 29% of straight men. While these figures suggest that women are somewhat less likely than men to commit partner violence, they also show a fairly small gap. The findings are consistent with other evidence that same-sex relationships are no less violent than heterosexual ones.

And finally this explains why you probably have never heard of this before:

For the most part, feminists’ reactions to reports of female violence toward men have ranged from dismissal to outright hostility. Straus chronicles a troubling history of attempts to suppress research on the subject, including intimidation of heretical scholars of both sexes and tendentious interpretation of the data to portray women’s violence as defensive. In the early 1990s, when laws mandating arrest in domestic violence resulted in a spike of dual arrests and arrests of women, battered women’s advocates complained that the laws were “backfiring on victims,” claiming that women were being punished for lashing back at their abusers. Several years ago in Maryland, the director and several staffers of a local domestic violence crisis center walked out of a meeting in protest of the showing of a news segment about male victims of family violence. Women who have written about female violence, such as Patricia Pearson, author of the 1997 book When She Was Bad: Violent Women and the Myth of Innocence, have often been accused of colluding with an anti-female backlash.

I wasn’t surprised by any this, because I’ve written about surveys on who commits more domestic violence before on this blog, as well as on the problem of violence in same-sex couples (reported by the leftist Atlantic magazine). It’s very important for people to understand that there are groups in our society who are very invested in painting men as the aggressors and women as the victims. But, if you look at the actual numbers, then quite a different picture emerges. You don’t even have to go to conservative sources, as you can see.