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Not Safe For Life is something graphically disturbing like a beheaded man or a dead dog hanging on a tree.
the one you just referred are called an ecchi (Jap for perv) image. so that's not really a NSFL avatars.
fun fact: NSFL originally means Not Safe for Lunch. dunno how it changed
Thats why I wrote NSF
W. Most "NSFL" things dont seem to bother me, but - again - would bother my boss, which in turn is a problem for me.