I like when mental illness is explained in terms of...
penis and vagina.
I guess it's funner to represent psychosis with images of phallic monuments, keys being inserted in to keyholes, hands coming out of gloves, oh, and rape fantasies. It's kind of harder to represent psychosis through chemical fluctuations in the brain, or conditions in the brain that alter how the chemicals in the brain work.
This movie kind of reminds me of those old timey vibrators that psychologists used to prescribe to women suffering from psychosis. I think a vibrator would have solved all of Carole's problems, considering that she went in to hysterics (Check out the original Greek definition of that word.) because her vagina craved the cock, but her brain remembers her daddy the rapist, so she couldn't have sex.
I also love that when she goes crazy, she also becomes homicidal. That's always fun when that happens.