While it has its moments, Sex Tape is not as risqué as it thinks it is or as funny as it wants to be.

What it does have is two actors in Cameron Diaz and Jason Segel who are gung-ho in their roles as Annie and Jay, a married couple with two kids and not enough “quality” time who decide to rekindle their dormant sex-life by recording a marathon sex session on Jay’s iPad….only to have it leaked onto Jay’s “Cloud” network.

Diaz (who needs a solid rebound after starring in the dismal The Other Woman) and Segel are the perfect actors for this kind of raunchy comedy: Solid comedic thesps, with a knack for slapstick and no qualms about showing flesh. Diaz is particularly impressive in that regard, with the 42 year old actress cementing her status as a sex symbol that will have many a male viewer hot under the collar.

Sex Tape needed more than eye candy to be a success. A solid script for instance would have gone a long way.

Originally written by Kate Angelo (she who wrote the dreary Jennifer Lopez rom-com The Back-Up Plan), the screenplay was given a polish by Segel and his regular collaborator Nicholas Stoller (Forgetting Sarah Marhsall, The Five Year Engagement). This is not there best work, with the characters dull and the laboured humour forced to little more than chuckle worthy results.

However at times there are moments of hilarity, yet not from Diaz or Segel but a scene stealing Rob Lowe. He plays a squeaky clean executive who behind closed doors is anything but, as if Ned Flanders revealed himself to be Ozzy Osbourne.

It’s during his scenes where Diaz and Segel really get to flex those comedic muscles. But when on their own things settle down much too quickly, with too much schmaltz about love, marriage and kids, exactly the stuff people don’t want to hear about when watching a film called Sex Tape.

The rest of the time Diaz and Segel seem content with plugging Apple products, with the word “iPad” mentioned dozens of times and lavished upon with pitch perfect zeal.

The director of Sex Tape is Jake Kasdan. He previously directed Diaz and Segel in Bad Teacher. He also directed Walk Hard: The Dewey Cox story, a glorious spoof of music bio-pics that was bat-shit brilliant in every way. Sex Tape needed more of that energy and lunacy.

As it stands Sex Tape is an R-rated comedy that thinks it’s provocative, yet is handcuffed by the inhibitions of its rom-com genre. It’s a shame that with a game Diaz and Segel on side, Kasdan couldn’t break through convention to deliver something a little more rowdy.