I liked Norton best in "Primal Fear", but American History X is a close second. I really think he's sort of a "great underdog" in charcter actor roles--(that is, well behind Philip Seymour Hoffman and Samuel L Jackson.)
I thought the way Norton "hulked up" for AHX was amazing-- and he was totally credible as a nazi skinhead. The shower rape scene surprised me when I first saw the movie-- but I don't recall it "doing anything" for me. Then again, I'm not an ass man and I damn sure don't recall ANY FRONTAL NUDITY of Norton. I do remember getting slightly turned on from Norton's opening scene, when he was in bed with the gf. But still, NO FRONTAL FLASHBACKS for me.
I bought the dvd 2 years ago, but never watched it at home. Not to refute you "Henry Miller", but if others on this thread can confirm Norton's frontal nudity in AHX, then I will rip the shrink-wrap off that nazi m-f-er and check him out in slo-mo!