I think what Stiffy said regarding the aesthetics of porn makes a lot of sense. Moreover, women being into women is not unusual at all, not now or historically.
But I think I may have a truly odd situation for you, in that it kinda came outta nowhere.
I used to be a fan of comic-book illustrator Patrick Fillion's stuff about 10 years ago, back when he worked for Avatar Comics, drawing a series called Avengelyne. It was pretty basic comic-book fare, as per Wikipedia: "Avengelyne is an angel who fights the forces of evil and often finds herself face-to-face with demons, monsters, and the like. The original character design for Avengelyne was based on the likeness of former Vampirella model Cathy Christian."
So one day I was bored and decided to do a web-search for Fillion to see what he was up to, and let's just say that what he's doing now is way different than what he did in the past. If you're interested, you can find his portfolio at PatrickFillionDotCom. (I'd correctly write it out, but I'm not sure about the rules regarding linking to other people's websites, and I don't feel like getting myself banned.) As a heads-up, again per Wikipedia: "Fillion's series characters are primarily young, muscled males with improbably large penises. Ethnically diverse, they find themselves in a plethora of dangerous and sexual situations [mostly of a homoerotic nature], often involving equally sexualized aliens and supervillains."
And yet, I couldn't help but look at his website. I still check it out on a regular basis. How do I explain that? I can't. In the grand scheme of things, does it really matter? Not really, I guess.