robert culp and natalie wood play a very liberated couple who basically love each other . when they cheat on the other they discuss it and talk out their feeling and end up still madly in love . they share their view with another couple play by dyan cannon and elliott gould . they try to convert them to their way of thinking . but will it work or tear them all apart . for starter this film would not be make today . with hiv and aid out there the casual sex show here be a stupid idea . and can anyone seriously say they would honestly tell their partner that they have cheat on them and discuss it . that aside and i still sort of like the movie . the script be well write with some sharp observation on sex and love and i find the discussion between culp and wood fascinating . also culp and wood give out great performance ( i especially liked wood little smile ) . cannon be good too but and surprisingly and look horrible . gould be just ok. but the script carry this one . if you can accept the idea in this it work . however it all end in a laughably horrible end that ( almost ) destroy everything that go before . end aside and i think this be a pretty interesting and a ( i think ) accurate picture of the late 1960s . worth a look . i give it a 7 .