Sex with a Smile is a 1976 Italian comedy film directed by Sergio Martino and starring Marty Feldman, Barbara Bouchet, Edwige Fenech, and Dayle Haddon. While the cast was relatively popular internationally, advertising for the film in the U.S. concentrated almost exclusively on Marty Feldman, even though he only appeared in one segment of the film.

The original Italian title was 40 gradi all'ombra del lenzuolo, colloquially translatable as 40 Degrees Under the Sheets (40 degrees Celsius equals 104 degrees Fahrenheit). It was followed later in 1976 by a sequel titled Spogliamoci così senza pudor, colloquially translatable as Let's Get Naked Without Modesty.