Soft Beds, Hard Battles

Soft Beds, Hard Battles is a 1974 British comedy film directed by Roy Boulting, and starring Peter Sellers in several roles, and an all star cast, including Curd Jurgens, Lila Kedrova and Jenny Hanley. Sellers reunited with the Boulting brothers for this farce in which a brothel full of ladies helps the war effort by ridding the world of Nazi peril in the bedroom. The film took a limited release in the United States, it was released under the title Undercovers Hero.

Source: Wikipedia