"97 perfectly identical between the same people. Nevertheless, these three phases are very common among most people. As sexual intercourse begins both males and females pass through three phases. Excitement phase is when blood flows to the pelvis bringing, more lymphatic fluid and plasma to the region. Because of hormonal and psychological stimuli there is generally swelling in the sexual parts. While this is happening, the plateau phase begins which is when more hormones are released, moisture increases, heart rate increases, intensity of sensory perception increases (touch, smell, sight, hearing, and taste). In the orgasm phase an electrical build up of energy is releas ed that is associated with a rhythmic contraction of the pelvic floor muscles, the urinary and anal sphincters, and of various glands for males. This is called an orgasm. After the orgasm finishes, resolution eventually allows the sexual parts to return to pre - excitement conditions. These are almost identical in every way between males and females, except that there are differing sexual parts for each. Thus, a sexual response in a typical female would typically follow a pattern similar to this one. In the excitement phase, blood and lymphatic fluids increase swelling inside the vagina. Hormones are secreted which lead to a mild uterine contractions which raise the uterus away from the pubic bone. The labia swell and the clitoris becomes hard. The vaginal t issues secrete moisture and the vagina itself lengthens and expands slightly inward. The plateau phase begins as excitement continues. This causes the labia to become fully swollen, the clitoris to recede under the clitoral hood, and the uterus to become fully elevated (the hormone is called Oxytocin). The vagina is fully lengthened into the body, and, just before orgasm, lubrication ceases. During orgasm, the pelvis of the female experiences a series of contractions which occur every 8/10ths of second and can number anywhere from 1 - 20 or more in the sequence. The contractions include anal and urinary sphincter contractions, the smooth muscles in the inward portion of the vagina contraction, the puboccocceygeus muscle contraction, the uterine contractions w hich cause the uterus and cervix to dip down into the vagina, and general muscles contractions in the body. Further, an electrical sensation surges from the clitoris radiating throughout the body and stimulates the pleasure centers of the brain and a rele ase of the hormone called Oxytocin. When the orgasm ends, the body eventually returns to its pre - excitement state. In general, females have more capacity to experience more contractions over a longer period of time than do males. Females have been found to have much more capacity for sexual intercourse than males. This means females can have more sexual intercourse, more often, and with more orgasms than can the average male. The male anatomy is presented in Figure 4. The male has a penis which is compri sed of 3 spongy - like tissue columns that engorges with blood during excitement. A cross - section of the penis shows two outer columns and one column on the underneath side. The average male penis is just that — average. About 4 - 6 inches reported by Masters an d Johnson. Since the vagina is 3 inches in length and has very sensitive regions near the outside of the vagina"