When a person is mentally or physically stimulated about sex, a series of physiological changes will occur in the sex organs and other related parts, called sexual arousal. 1. Sexual arousal, that is, the physiological and psychological preparation before mating, aims at better mating for both men and women. 2. The performance of male and female sexual arousal is different, female sexual arousal is mainly manifested in the increase of vaginal secretion, so that the vagina becomes lubricated, the clitoris is erect, the breast will also be rapidly engorged with blood, its surface will also become red and hot, swelling, nipple hardening; while the male sexual arousal is the most important performance is the erection of the penis. 3. Before mating, let both men and women into the state of sexual excitement can not only make both men and women more enjoyable, help couples, couples between the feelings, but also can effectively improve the quality of sex and pleasure. However, due to the individual differences of each person, the performance and degree of sexual arousal will be different, if you find yourself with an abnormal reaction, you should consult a doctor in a timely manner, do not be negligent, so as not to delay the condition.