To be clear, straight women can be aroused by images of women. In scientific terms, they would, indeed be bisexual—in that they are attracted to both sexes. But when we use the word bisexual, we’re usually referring to both sexual and romantic identification. In other words, when we think of bisexuality, we’re often imagining women and men who are not only aroused by both sexes—but who would date both sexes. So, yes, these women can be called bisexual, but that’s also oversimplifying things.