I think that it could potentially fall onto the far, far edges of sexualised, but only in the context that Jeph has also sexualised sitting on cakes, robot feet, lolita demon girls and anthromorphic toilets. After all; technically, we can see more of what's-her-face's butt than we did of Claire's when she stripped naked and prepared to lose her virginity.

We wouldn't give it a second thought in another webcomic, but QC has strayed into this territory before and it ended.... poorly. It is still crude and kind of stupid, and I think one would have to be extremely prudish to consider it pornographic or anything of that bent. It's sexual like a **** joke; it involves a person and their private anatomy, but that in itself isn't the objectionable part.