Wait... Moviebob is trying to say that it was hard to for kids to see boobs in the 1980s?
Okay, thinking back to the 1980s it occured to me that this was the golden age of the PG-13 "boobie flash" movie. We had films like "Zapped" which used telekinesis as a gimmick to have a dude rip girl's shirts open (more or less). Then we had the whole "Porky's" thing and tons of other movies. Oh yes, and then there was "Revenge Of The Nerds".
Indeed the "nudity" and ultra-violence lead to the entire European "Video Nasties" list and an attempt to basically engage in massive censorship. This leaked into the US somewhat but eventually died out. It reminds me vaguely of the entire scare over sex and violence in video games (and like the video nasties is mostly pointed at horror it seems).
While it's true that not everyone had a VCR and TV in their room, most families DID have one and this was also the golden age of both video piracy, and mom and pops video rental businesses which were literally opening up everywhere as one of the big business booms due to the popularity of the format.
As the "Video Nasties" pointed out most people running these places didn't much care what kids rented. One of the reasons why they make such a big deal about carding kids trying to get "R" rated movies and such nowadays.
The point being that kids could just walk in rent whatever they wanted, mom and dad probably didn't pay that much attention if the kids wanted to go rent a couple of movies and watch them while they were at work or whatever.
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At any rate as far as Heavy Metal goes, I can see the criticisms despite being a big fan myself. I think one of the problems with it is that it hasn't aged well. While it IS true that there was animation and such that was much better, there was also a lot of it that was worse. For example Ralph Bakshi might be remembered for "Fire and Ice" and working with Frank Frazetta to make it, but he also produced things like "Street Fight", and "Wizards".
While there were similar things I believe Heavy Metal largely succeeded because it was dealing with concepts (science fiction, etc..) that were still uncommon, even if not totally original. I think this is also the appeal of "Wizards" which is another cult classic.
Basically I think there is more to it's status than "it showed tits" but it simply hasn't aged gracefully. Nowadays you can find anime that outdoes it in pretty much every way, BUT that wasn't the case at the time, and also if you look at what the anime of the time period looked like in many cases, it actually held up fairly well in comparison.