Its a very complicated issue.
I think the vast majority of people in the country live in warm loving relationships with no violence at all. However, there will always be a percentage of people who are anti-social with each other, aggressive, violent etc. As police, we tend to go to the same people over and over again having similar domestic violence episodes.
I think aggression levels between males and females are pretty similar although slightly weighted towards the males - so that if you stop a random male and female in the street it will be about 60/40 aggression level for male/female. Of course by maths therefore, your top 100 violent people will all be male.
I think male victims of DV are under reported for lots of reasons - we go to loads of jobs where the male has obvious injuries, but brushes them off as 'I fell over'.
There was an interesting social experiment on YouTube a while ago where a male & female actor were sat on a bench and began to have a verbal then violent domestic incident. When it was the male attacking the female - all the passers by helped out, split them up, grabbed hold of him, phoned the police etc. When it was the female attacking the male in the same way - the passers by just watched, laughed, filmed it on their phones. Probably why the male would be reluctant to seek help in that situation and just try and sweep it under the carpet.
You should also take into consideration other forms of violence towards each other. Harassment, character assassinations, criminal damages, thefts for example. The occurrences/reporting of these in a domestic setting tend to be more equal between males & females.
I might be wrong, but wasn't there a coronations street actress recently who smashed her ex-partners car up with a baseball bat - but it seemed to be reported in the media as something trivial.