The Great Swindle (1971)

Two professional con artist, seductive and tough brunette Carla and handsome but ruthless Arturo, try to seduce and blackmail each other, unaware of their real identities. Once they realize they're of the same kind, they team up to do a number on an older rich man called Luis and a younger beautiful blonde called Lola. Lola falls for Carla, who decides to play hard to get in order to avoid actually becoming intimate with a woman in any way, which frustrates Lola. A sudden death occurs which changes the playing field a bit, so Carla decides to use this to her advantage.