proposes a nonlinear model of female sexual response. Her model emphasizes that females have sex for many reasons, and that their sexual response may not proceed according to predictable stages. The clitoris is, for most females, the point of origination for sexual pleasure. It has thousands of nerve endings, making it highly sensitive. Portions of the clitoris extend deep into the vagina, allowing some women to get indirect clitoral stimulation through vaginal stimulation. Learn more about the clitoris here. For men, the head of the penis is similar to the clitoris in that it is often the most sensitive area. For sex to feel pleasurable, the brain has to interpret sexual sensations as pleasurable. Nerves in sexual areas of the body send specific signals to the brain, and the brain uses those signals to create various .