Women perpetrate physical domestic violence significantly more often than men, in both teen and adult couples.
http://www.nij.gov/journals/261/who-perpetrates.htm
http://ajph.aphapublications.org/doi/abs/10.2105/AJPH.2005.079020
"Almost 24% of all relationships had some violence, and half (49.7%) of those were reciprocally violent. In nonreciprocally violent relationships, women were the perpetrators in more than 70% of the cases."