This has just come up in another thread and is a favourite of the TRAs/MRAs to deflect from male violence and to argue that female-only safe spaces don't matter because "you still let those awful abusive lesbians in".
This is the research from which they get their 'evidence' - www.ncjrs.gov/pdffiles1/nij/181867.pdf It's on page 30 and there are two paragraphs to it, the second of which they never seem to have got round to reading:
The survey found that same-sex cohabitants reported significantly more intimate partner violence than did opposite-sex cohabitants. Among women, 39.2 percent of the same-sex cohabitants and 21.7 percent of the opposite sex cohabitants reported being raped, physically assaulted, and/or stalked by a marital/cohabiting partner at some time in their lifetime. Among men, the comparable figures are 23.1 percent and 7.4 percent (exhibit 8).
At first glance, these findings suggest that both male and female same-sex couples experience more intimate partner violence than do opposite sex couples. However, a comparison of intimate partner victimization rates among same-sex and opposite-sex cohabitants by perpetrator gender produced some interesting findings: 30.4 percent of same-sex cohabiting women reported being victimized by a male partner, whereas 11.4 percent reported being victimized by a female partner. Thus, same-sex cohabiting women were nearly three times more likely to report being victimized by a male partner than by a female partner. Moreover, opposite-sex cohabiting women were nearly twice as likely to report being victimized by a male partner than were same-sex cohabiting women by a female partner(20.3 percent and 11.4 percent).
Of course, as more and more heterosexual males 'become' lesbians it will become increasingly difficult to disprove these statements as it will be reported and recorded as abuse committed by women against women.