Mature enough for furry porn, or actual artistic nudes and so on? The latter, I'd say it's probably fifty-fifty, you'll get a few more huh-huhs than the average phallic-shaped ship gets here. The former, being fetishistic porn, has nothing to do with maturity in the psychological sense at all, and hence has no lower limit, but has an upper limit of good-christ-man-just-don't-for-the-good-of-mankind.
This sort of thing has happened before, I always eventually bloody end up being stupid and clicking out of curiosity, and it's really painful when I wake up after seven hours of trying frantically to put my eyes out with something wholly unsuited to the task like a claw hammer. And I will blame you for it.
Fact, the fact that you're this worried about it is a pretty strong sign that you know it's something that's going to cause a lotta retching here for very little redeeming value; someone who considers something in the bounds of good taste- whether the art in question be nude, quasipornographic, or otherwise, doesn't hem and haw this much. So, really, why even bother with the stammering about? Is this like the old middle-school bit of "Ooh, I've got some really great hardcore stuff but I can't show you because it's so nasty"? Because, you know, that really didn't impress anyone back then, and it sure won't now. Stuff that primarily involves masturbating over pictures of dickgirls and so on typically doesn't. Especially these days, when anyone who wants to jack off over something horrible can find appropriate materials in seconds. Fine, you like beating off over something disgusting, you have pictures. We really, deeply,passionately don't care. Come back when you have something actually worth showing to the class- that being something that doesn't involve you and a gallon jug of Astro-Glide.
