Sexually explicit films opened producers and distributors to prosecution. Such films were produced illicitly by amateurs, starting in the 1920s, primarily in France and the United States. Processing the film was risky as was their distribution. Distribution was strictly private. In 1969, Denmark became the first country to abolish censorship, thereby decriminalizing pornography, which led to an explosion in investment and of commercially produced pornography. However, it continued to be banned in other countries, and had to be smuggled in, where it was sold "under the counter" or (sometimes) shown in "members only" cinema clubs.