Originally posted by Zmithy:
Although on a less filthy level, you could ask why Leela is the most commonly-drawn character - even by the [non-lesbian] female artists. I've never understood that.
Well, for me (and yes, I am a fanartist--I go by Leela's Twin on TLZ/Futurama Madhouse), it's because I find her the easiest to draw. For some reason, I find females in general easier to draw than males, and I find Leela easier to draw than Amy (easier hairstyle, though it is harder to give her emotions, what with the eye and all). Also, Fry is the easiest male on the show for me to draw--he's drawn relatively simply--so Leela and Fry are pretty much the only characters I can draw without having them look too bad. (This works well, considering the fact that I'm a shipper.)
...Wow. That wound up longer than I had expected.
As for the Futurama porn...I can't really say. For the most part, I'm more attracted to actual men, rather than two-dimensional drawings (though I must admit that Fry's pretty damn cute), but I'm sure there are some people out there with cartoon fetishes. Or something.