Why are they attracted to other women?

I use scare quotes because they’re really bisexual, not that there’s anything wrong with that. Most women who “become” lesbians later in life for various reasons (like having a lot of bad experiences with men) were always bisexual, because it makes evolutionary sense for them to be. It also explains “LUG”s (lesbian until graduation).

I would go beyond the thesis here and note that women compete with other women on their looks, so they’re actually pretty finely attuned to the attractiveness of other women.