There is no absolute answer. When I worked in the business, from 1973 to 1982, there was a spectrum of films, from the solo strip films (think Virginia Bell) all the way to "Deep Throat" and everything between. That spectrum was the result of the legal situation. In the 1960s a number of obscenity cases had been decided by the U.S. Supreme Court with language which spoke of "community standards", meaning that different places might have different standards. By 1973 matters were further confused by a case called "Redrup" which had held that if a majority of the SCOTUS concluded that a film was not obscene, the case would be dismissed.
As a practical matter that meant that a lot of film would be shot; post-production would edit a softcore version, a "hard softcore" version, and a straight hardcore version. Most of these were seven or eight-minute "loops". They would then be distributed in their various "communities". The version that played on 42nd Street in Manhattan was harder than the version that played on Long Island.
Given the proliferation of video porn, things may be different now; I don't know.
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