Recently divorced career woman Alex Greville begins a romantic relationship with glamorous mod artist Bob Elkin, fully aware that he's also intimately involved with middle-aged doctor Daniel Hirsh. For both Alex and Daniel, the younger man represents a break with their repressive pasts, and though both know that Bob is seeing both of them, neither is willing to let go of the youth and vitality he brings to their otherwise stable lives.

A young London couple who have trouble remaining faithful to each other visit Italy, where the husband's cheating ways come to a head when the secret lover of his equally cheating wife turns out to be a potential business partner.