I think the study that is often referred to is this one: https://www.cdc.gov/violenceprevention/pdf/nisvs_sofindings.pdf

The stats: Lesbian – 43.8% Bisexual women - 61.1% Heterosexual women – 35.0%

But I'm pretty sure male partners are included in these stats. There is a gender breakdown somewhere in there if I remember correctly. But in those overall stats above, I think men are included - think closeted lesbians, bi women who self ID as lesbians etc.

It also says this:

"Consequently, the basis of the key independent variable in this report, current sexual orientation, may not represent the sexual orientation of respondents when the violence actually occurred"

edit: Here's something from NCADV: https://ncadv.org/blog/posts/domestic-violence-and-the-lgbtq-community

"43.8% of lesbian women and 61.1% of bisexual women have experienced rape, physical violence, and/or stalking by an intimate partner at some point in their lifetime, as opposed to 35% of heterosexual women." It doesn't specifically say partners of the same sex it just says 'intimate partner'

But the numbers seem to be pulled from the earlier study that I've linked.