I have to agree that in most of my cases violence isn't mentioned - and I ask all new clients about this.
You jaundiced hack you!!!
I do agree that violence as a one off at the point of separation is viewed differently to sustained relationship violence. It's my personal view that if you confess to your spouse you've had an affair you might expect an explosion of anger. I've had female clients slap and punch male clients and vice versa.
I'd say it depends on the demographic. I once worked in an inner city Legal Aid practice (Liverpool) and there was masses more reported DV then than I come across now in my affluent Home Counties practice at the moment.
Of course there's always going to be some, but I saw a marked decrease.
At the moment, I'd say DV incidents reported in behaviour cases are 10% or less.