it's all people brainlessly regurgitating the first moron who misread a study. A third of "lesbians" in one american survey reported to being abused by men. I have no idea how a lesbian sample can not only have a third of it who had dated a man, let alone who even got abused by those men. Anyway this inflated the rate of "lesbian domestic abuse" and people ran with it.  For a better idea, Canada studied domestic violence in same sex couples on a period of 8 years, Most of it is still perpetrated by men by a smaller margin (55-45), common assault was the most common offense, and then men were more likely to commit major assault, while women were more likely to utter threats. Men committed 86% of same sex homicides of intimate partners. And that's just same-sex domestic violence, it's not even getting into male abuse of women. Curiously you won't see those people go "Why are men so violent?" ;)