Men are also victims of domestic violence, and yes, men do sustain serious lifelong injuries. As men, we are taught not to hit a woman, so if a woman hits us, we have no way of defending ourselves. Men are also told by society to "suck it up and be a man", which adds incredible pressure when a situation arises, because we are expected to be the "strong" ones.
Stats can be made to say anything you want them to say. Just by imncluding or excluding certain factors or criteria.
An international study of university students showed that the majority of violence (68%) between couples is mutual (both hit each other), then it is female against male violence, and finally male against female violence.
On the other side is the mental abuse men endure at the hands of the women they love. These statistics are not available, but women are very good at the emotional mind games, where me are very linear and logical.