(so went the hopeful dvd cover blurb, trying to make this feeble comedy into something important...)
Their posh house is full of rooms in bilious colours (one longs for Minnelli and those decors and that sure comedy touch in THE RELUCTANT DEBUTANTE) and Kerr is unflatteringly photographed and costumed (she was getting rather matronly as the '60s progressed and her film career was winding down). She is Prudence and Niven is the husband, both are fed up with each other and having affairs - she with her doctor Keith Michell, and he has his professional mistress, played (amusingly) by professional mistress Irina Demick (Darryl F Zanuck's latest at the time, he put her in several Fox films of the era). The lower classes are represented by their maid Vickery Turner and the chauffeur, they are an item too. Then there is Niven's brother, silly ass Robert Coote, (being very silly ass here) and his wife, Joyce Redman (a rare movie role for her after that scene with Albert Finney in TOM JONES), and their mini-skirted daughter Judy Geeson, who is having it off with boyfriend David Dundas when mum and dad go to the cinema every week, however they return early this time and catch the two of them, in scenes which are painfully unfully and over the top.
It turns out daughter (god, this is tedious to unfold) was swopping her mother's contraceptive pills with aspirins, and it soon turns out that everyone is swopping pills (which are conveniently sold in bottles and not individually bubble wrapped as now). Niven wants Prudence to get pregnant by her lover, so he swops her pills, the maid though swops Prudence's with the vitamin tablets her boyfriend gives her, and so on.
Soon: another 1964 sex "comedy" - SEX AND THE SINGLE GIRL, I saw it but I don't remember it, was it that forgettable? Curtis again, and Natalie surely looking her best, and Dame Bacall ....