Deep Throat, thought to be the most successful pornographic movie, features in a list of 100 landmark films.
Deep Throat's star later became an anti-pornography campaigner
Radio Times magazine said Deep Throat was "the worst film to have major influence", but that it took "porn out of the back room and into the cinema".
Made in 1972, it was the first pornographic film widely seen in cinemas, earning $600m (£320m).
The list, for the Radio Times Guide to Films 2007, also includes Citizen Kane, Psycho, Pulp Fiction and Shrek.
The Radio Times said about Deep Throat: "Cheerfully trashy, charmingly silly, this was a phenomenon of its day, a sign that the sexual revolution was in full swing."
The film was banned in 23 US states on its release, and UK censors only passed an uncut version in 2000.
Computer-generated fantasy Shrek and last year's gay cowboy movie Brokeback Mountain are the only films released since 2000 on the list.
SELECTED 'LANDMARK' FILMS
The Birth of a Nation (1915)
The Jazz Singer (1927)
Snow White and the Seven Dwarfs (1937)
Citizen Kane (1941)
Easy Rider (1969)
Blade Runner (1982)
Pulp Fiction (1994)
Brokeback Mountain (2005)
Andrew Collins, the magazine's film editor, said: "While many of these movies are truly great, this is not a list of the greatest films of all time.
"These are films, major and minor, whose influence is still felt; time, context and circumstances have made them significant."
Disney's first full-length feature from 1937, Snow White and the Seven Dwarfs, is included.
The Beatles' 1964 film A Hard Day's Night is credited as a forerunner of modern music videos.
Meanwhile, Steven Spielberg's 1975 blockbuster Jaws is said to have "redefined the marketing for all future event movies".