I've seen quite a few movies before that had topless women in them that were PG or PG-13, National Lampoon's European vacation comes to mind, as does the film Radioland Murders. There was also Back to school which featured some nudity, PLUS 3 f-bombs! Halloween didn't have that much nudity to begin with anyways, and considering what they show on TV today, Halloween is no more violent then your average episode of 30 Rock. If it came out today and I were on the MPAA i'd give it a PG-13.