Being John Malcovich

I'm watching this movie right now and I forgot how weird it is. Cameron Diaz plays John Kuzak's wife in the flick and she's bisexual. She wants to hook up with John's business partner, but the business partner, Maxine, only wants to 'be' with her when she's inside John Malcovich. I know it sounds pretty fucked up, and it is really fucked up. I suggest watching the movie to understand. I just want to know what drugs the writer was on when he/she thought up this story. I might have to try some.