Sexual Chemistry (1999)

Sexual Chemistry (1999) Robert, an overworked chemist experimenting with new sex-enhancing drug, uses himself as a human guinea pig in order to make an impending deadline. His new drug works wonders on his libido, but has an unexpected side-effect: it turns Robert into a Roberta! Now he/she must find a way to become a man again, and get in touch with his feminine side, before it's too late.