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Jack Lemmon stars as Hogan, who lives a bachelor's dream as the manager of an apartment building that caters only to single women. Hogan likes to romance his tenants, and he sets his sights on a newcomer named Robin (Carol Lynley). Robin and her boyfriend David (Dean Jones) have moved in together, intending to see how compatible they are while maintaining a platonic relationship. This arrangement is the result of a suggestion from Irene (Edie Adams), a marriage counselor who is subletting her apartment to Robin while living with her own boyfriend, Charles (Robert Lansing). Irene thinks that Robin and David need to discover whether they are suitable as marriage partners without letting sex cloud their judgment. Hogan finds out about the arrangement and schemes to get David away so he can seduce Robin. The film is based on a hit stage play by Lawrence Roman.