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Hays code was a set of self-imposed industry moral censorship guidelines that governed the production of United States motion pictures released from 1930 to 1968. As an example, it was not allowed to kiss horizontally - i.e. at least one partner had to be sitting or standing. Married couples slept in single beds, and if they kissed 'good night', at least one of them had one foot on the ground. A kiss was also not allowed to last more than a few seconds.