L'avventura by Antonioni
Very good, but kind of drawn out at parts. Visually it's really stunning, which is one of the reasons I could sit through the drawn out parts, and the acting is good. It stars one Italy's two biggest stars. It's very existential. So far one of my favorite Antonioni. Really questions the fine line (or concept of a line) between sexuality and love.
This trailer kind of makes it sounds like a porno: