Although it seems to be relaxing a bit, especially on the coasts and in bigger cities, you can thank Anthony Comstock and his bullshit purity crusade for a lot of it. Most of the folks I know anymore aren't that prudish, but you still find it just about everywhere you go.
I remember when I was younger, it was fine to watch all kinds of violent action flicks. Hell hath no wrath though like my family if a pair of tits were on screen when while I was about.
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