I'm a man, my wife used to hit me.
She is the only female of her generation in her extended family and youngest too. When the boys in her generation became teenagers, they got her to punch them in the stomach as hard as she could to show how tough they were. When we got together, it was her first real relationship.
After we had lived together she started to punch me at infrequent intervals. She assumed it didn't hurt based on her experience with her extended family when she was a child. It's true, I didn't ever suffer lasting physical damage - the pain left quickly. Can't say it ever felt good or that I could relax in my home when I didn't know if she was coming to punch me or just hug me -- even though I didn't suffer any lasting damage ever or feared that I would.
On the day I finally pointed out she was physically abusing me she stopped and never did it again. She didn't accept that was what she was doing at first, but eventually agreed.
My 'suffering' was as mild as can be, utterly trivial in comparison to almost every other victim. It was most of a couple of decades ago, I've not forgotten those times - being randomly punched by someone who professes love and admiration is hard to forget. Until now, I have never told another soul - who could I, that would not laugh at me. She did tell her brothers, they did laugh at me.
I say this - not to request sympathy, I need none, but to say that when men are abused - even when the physical harm is a minimal as can be, it does not mean there is no mental harm and that I suspect it is a lot more widespread since it is almost never taken seriously.
By all means flame me for saying anything about my own experience when women clearly suffer so much more. The thread is titled: "Domestic abuse- male victims & statistics", so thought I could offer my own experience.