Teenage boys have the most physiological reactions.

Boys aged 5-6 may also have physiological reactions. If it develops normally, it will start before 1 1- 13 years old.

Men and women will have a physiological reaction after they are about thirteen or fourteen years old, that is, adolescence, but each boy's physique is different, and his development and physiological time will be different.

Extended data:

Generally speaking, men are faster, stronger and more eager for sexual excitement, while women need longer time to enter the sexual excitement period. Women are more interested in love than sex. Only when women are fully awake can they reach orgasm easily.

The first stage of the sexual response cycle is the awakening stage. From the non-excited stage of sexual desire to the aroused stage of sexual desire, the body began to show tension and mental excitement. This period is characterized by male erection and female vaginal lubrication. Sexual impulse is the sexual impulse and desire caused by the opposite sex sensory area perceived by vision, hearing and touch.

These sexual stimuli can produce sexual impulses and desires of men and women. However, the time required for different people from non-sexual arousal to sexual arousal is very different, that is, the time required for the same person to enter the arousal period is not necessarily the same.

During sexual excitement, the male penis is erect, the testicles are congested, and the scrotal skin is thickened and hardened; The female clitoris is congested and swollen, the labia majora is separated, the labia minora is swollen, the color is deepened, the leucorrhea is increased, the vagina is lubricated, and the distal vaginal opening is expanded by 2/3. Uterine erection, breast enlargement, nipple erection.

When sexually excited, the muscles of men and women's legs, arms, hands, neck and lower abdomen are relatively tense, and the muscles of pelvis and perineum will involuntarily contract and even spasm. Blood pressure rises, the heart beats faster, breathing deeper and faster, and the skin temperature is higher.

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