Rabid

Rabid is a 1977 body horror film written and directed by David Cronenberg, and starring Marilyn Chambers, Frank Moore, Joe Silver, and Howard Ryshpan. The film follows Rose Miller, a woman who, after being injured in a motorcycle accident and undergoing a surgical operation, develops an orifice under one of her arms that hides a phallic/clitoral stinger she uses to feed on human blood, spreading a disease from the Quebec countryside into urban Montreal.

Synopsis from Wikipedia, CC BY-SA 4.0. Everything below written here.

Poster © the film's rights holders.