use of amateur cinematography. Entrepreneurs emerged to supply this market, such as Harrison Marks who produced 8mm "glamour home movies" throughout the 1960s. Nudity in film came to the British cinema screen with the British nudist films of the 1960s, beginning with Harrison Marks' Naked as Nature Intended in 1961. These films claimed to depict the lifestyles of members of the nudism or naturist movement, but were largely a vehicle for the exhibition of female nudity. They were mainly shot in naturist resorts, but augmented by attractive glamour models. The nudity was strictly non-sexual and when filmed frontally the members' pubic area was strictly covered by the angle of shot or some clothing or other objects. There was uninhibited exposure of breasts and backsides. The acting and technical production standards were not very high and the outlets for their exhibition were very limited, as was the size of the audience interested in these films, and many films were re-released several times under new titles, to trick patrons into seeing the films additional times. What audience there was lost interest in these films by the mid-1960s and production ceased. In continental Europe films were more explicit in the 1960s, and some of these more explicit imported foreign films began to appear in the UK in that decade. The legalisation of pornography in Denmark and the Netherlands (1969) and Sweden (1971) led to an explosion of commercially produced pornography in those countries. The Color Climax Corporation became the leading European pornographic producer for the next couple of decades. In public cinemas in the UK, imported pornographic films were subject to a great deal of censorship and had many cuts in them. However, uncut pornographic films were often smuggled into the UK, where they were sold "under the counter" or (sometimes) shown in "members only" cinema clubs. Hardcore films could be screened in British cinemas if they were run on a "Membership Only" club basis. Membership Only cinemas worked on the principle that the premises had to be privately owned, and that customers had to sign a form which instantly made them members. On account of this legal loophole in the Cinematograph Act 1952, these cinemas were free to show material without it first being passed by the BBFC or local council, and would also be immune to prosecution under the obscene publications act. Cinemas began using this loophole to show soft core