Well, to be fair, there not being many records of it doesn't necessarily mean it didn't happen but I'm not aware of too much historical evidence for it (and, at least in Europe, most of the old laws forbidding it only applied to men, not women). Always happy to learn, though, so if you have any links, please do send them my way :). As far as I'm aware, lesbians in most societies were mostly oppressed in the sense that they didn't have much say in what happened to them, whom they got married off to, etc. which was also the case for straight women. They were often treated more as cattle than independent human beings. (Of course, there are some notable exceptions like ancient Egyptian society.) Two women engaging in a sexual relationship wouldn't have posed as much of a threat to the ironically fragile construct of patriarchy as two men because, well, they were still women. One of them being on top wasn't going to magically turn her into a man. (And they couldn't impregnate one another so the male line was safe.) A man being penetrated, though? That was considered a huge threat to the idea of men being strong and powerful and in charge. Can't have that. (Please picture me rolling my eyes profusely while writing all this.)
