“Divri- I don’t think we paskin halachah from Midrash. “
do you make the bracha of baruch shepatrani
if you do with shem and malchus you pasken 100% from a medrish
if you do without shem and malchus you still pasken from a medrish but not enough to make a bracha with shem and malchus
“The fact is, two women “marrying” each other is only an issur d’rabanan (I’m pretty sure that’s how the Rambam paskins- I have to look it up), which would certainly not apply to goyim.”
1. the rambam pasken’s it’s deoraysa, the punishment is derabanan
2. the source of the rambam’s psak strongly implies it’s ra biaynay hashem for a goy to be a lesbian even if it’s not assur (though I would argue that a lesbian “marriage” falls under apikorsus which a goy is michuyuv in, and thus the pshat in the vayikra rabah)