1) both men and women can be physically, mentally or emotionally abused by their significant other.
2) men and women both choose their actions, and when problems occur any individual of any gender in the partnership can choose to behave violently towards their spouse (although this is wrong).
Really there's no right answer, but here's my opinion if it helps!
Both men and women could become victims of domestic violence. One of the reasons may be that the other partner (the one doing the abusive action) is mentally disabled, or has had some kind of trauma is his/her life. Also, this may happen when men or women force each other to do things. This can happen between both genders.