This was the last of the three comedies that Jack Lemmon made in the middle 1960s that he hated. Like GOOD NEIGHBOR SAM (and not like the abysmal UNDER THE YUM YUM TREE) HOW TO MURDER YOUR WIFE had a clever script and good production. Lemmon played a successful cartoonist who carefully scripts and photos the scenes he will use in his detective adventure strip. He lives in a townhouse, complete with top rate valet (Terry-Thomas) and has a wonderful life as a bachelor. But while attending a stag party, he meets Virna Lisi, and takes her home. Apparently he has married her (the groom at the stag party had broken up with his fiancé before the party, and throws the wedding ring out - and Lemmon uses it). As a result Lisi starts domesticating him, and Terry Thomas walks out. Lemmon uses the changes in his lifestyle in the comic strip, but finally he revolts and kills off the comic strip version of Lisi. When Lisi sees this she walks out, but everyone thinks that Lemmon killed her. So the scene is set for a murder trial.
This is not a film for feminists. It takes a dim view at the effect of domestication on Lemmon (and his lawyer, a hysterically funny Eddie Mayehoff). But I point out that before the end Lemmon does admit he misses the domestication. Even Terry-Thomas gives into it at the conclusion. It still a good comedy, a worthy minor work if not one of the high points in Lemmon's acting career.