Quote Originally Posted by basschick
it has nothing to do with frontal nudity or sexual activity.

the term you are looking for is sexually explicit. masturbation, spread shots, fucking are all sexually explicit. artistic nudes are pretty much defined as NOT showing any "lascivious exhibition of genitals". also no masturbation or penetration.
2257 specifically invokes 2256 a-d. It specifically leaves out 2256 E which talks about lascivious exhibition of the genital - aka nudity which invokes lust.

some people think this is just a loop hole that would eventually be closed and revised to include 2256 E - which is why some ppl say nudity is ok and others aren't.