Every Home Should Have One (U.S. title: Think Dirty [1]) is a 1970 British comedy film directed by Jim Clark and starring Marty Feldman.

The film ridicules the then ongoing campaign organised by Mary Whitehouse against gratuitous sex in British entertainment and advertising.

[5] The film theme song, "Every Home Should Have One", was written by John Cameron, Caryl Brahms, and Ned Sherrin, arranged by Alan Tew, produced by Jackie Rand, and sung by Millicent Martin.

[9] The Monthly Film Bulletin wrote: "This feature debut by Jim Clark ... is a strictly hit-and-miss affair which reveals, once again, the dangers of trying to be fashionably contemporary and satirical at the same time.

But their efforts are totally overshadowed by a shambolic, leering performance from Feldman, making his second screen appearance, as a mad advertising executive who devises a series of steamy commercials for a brand of frozen porridge.