Sex Tape (15) **

Katie Price and Dane Bowers, Pamela Anderson and Tommy Lee, Paris Hilton and Rick Salomon and Tulisa and rapper Justin Edwards all faced a trial by media when their amorous antics suddenly materialised in the public domain.

Sex Tape is the raunchy tale of a happily married couple, who drunkenly agree to perform every position in The Joy Of Sex on camera for their private delectation.

When they first meet, Jay (Jason Segel) and Annie (Cameron Diaz) enjoy an impressively gymnastic sex life.

Two children later, there are few opportunities for amorous one-on-one time.

With their cherubic offspring (Sebastian Hedges Thomas, Giselle Eisenberg) safely entrusted to grandma (Nancy Lenehan), Annie and Jay excitedly agree to make a sex tape.

Unfortunately, the exhausted husband forgets to erase the video file and it uploads to the cloud and syncs to several iPads, which the couple have given away as presents.

Jay and Annie are horrified when they realise their energetic efforts are available to download to friends, family, the postman and Annie’s soon-to-be-boss, Hank (Rob Lowe).

When pals Tess (Ellie Kemper) and Robby (Rob Corddry) learn about the existence of the recording, they are aghast. Time is of the essence and Tess and Robby join Jay and Annie as they race through the night to delete the incriminating video file from the iPads .

Sex Tape is a tease that fails to arouse belly laughs or a deep emotional connection to the beleaguered characters. Diaz and Segel, who previously locked horns in saucy comedy Bad Teacher, are an attractive pairing, but the script short-changes them both.

Jack Black cameos late in the film as a porn website proprietor and makes the point that Jay and Annie could have resolved the situation with a simple e-mail or telephone call rather than racing around town like lunatics.

A truncated, 20-minute version of Jake Kasdan’s film has undeniable appeal.