a lot in the first 3 years of our marriage, less so now. In part the stresses have decreased (we had a couple bad years, between baby and toddler, DH's job issues, family and money stress) and in part because we have learned to communicate better and went to counseling. DH can still get aggressive at times when he's stressed, but I mostly don't respond and that often nips things in the bud.
Most of my previous relationships were very harmonious, so the fighting was relatively new and scary for me.