La Rose de Fer

La Rose de Fer English title The Iron Rose is a 1972 film directed by Jean Rollin. It was his first film not to feature vampires, a theme for which he was best known, but it still features all the dreamlike qualities associated with his films.

Once inside the huge cemetery, the woman becomes anxious. The man calms her and persuades her to enter a crypt with him. A strange man watches the couple. The man and the woman make love in the crypt. A clown places some flowers on a nearby grave and leaves. An old woman closes the cemetery gates.When the couple finally exit the crypt, night has fallen and they cannot find their way out. They begin to panic. They discover a small building inside are several childsized coffins holding small skeletons. The woman becomes moody and exhibits bizarre behavior and personality changes. She locks her lover in the crypt and he suffocates. Dawn finds the woman dancing around the cemetery, and later entering the crypt herself. The old woman reopens the cemetery gates. Finding the crypt closed, she puts flowers on top of it. ........

Source: Wikipedia