You see a girl getting dicked, but it's by another girl, so the only thing in the image that isn't feminine is the dick. For guys, it's basically lesbian porn with the ability to empathize with the feeling of your dick being pleasured. For girls, I suppose it's a great fantasy if you're bisexual in any measure to be fucked by a futanari, or perhaps wish you had a dick, but that's guesswork.
There's other aspects that appeal to it like a woman with a dick either having the depravity of a guy with a dick, or the opposite of a woman with a dick still being submissive.
I just wish it wasn't shockingly uncommon to find good material compared to other futa porn. I have some specific wants, but I don't think I'm picky for wanting decent futa-on-female with good art, full-package, the female being at least somewhat thick, and consent.
Pic related is probably the closest thing to a perfect futa image I've ever seen.