FACT

Under the Hays Code (1930-1968), people kissing in American films could no longer be horizontal; at least one had to be sitting or standing, not lying down. In addition, all on-screen married couples slept in twin beds...and if kissing on one of the beds occurred, at least one of the spouses had to have a foot on the floor.

(http://rainbowbrite2200.xanga.com/712874279/kissing-facts/ and htttp://facts.randomhistory.com/2009/01/22_kissing.html )