AP PSYCHOLOGY

Detailed explanation-1: -Orgasm, the conclusion of the plateau phase, is characterized by quick jerky muscle contraction of the lower pelvic muscles surrounding the anus and primary sexual organs accompanied by an euphoric sensation and a further increase in heart rate (Masters & Johnson, 1966).

Detailed explanation-2: -In the excitement stage, the body prepares for sexual activity by tensing muscles and increasing heart rate and blood pressure. In the male, blood flows into the penis, causing it to become erect; in the female, the vaginal walls become moist, the inner part of the vagina becomes wider, and the clitoris enlarges.

Detailed explanation-3: -In sexual response cycle. In the plateau stage, breathing becomes more rapid and the muscles continue to tense; the glans at the head of the penis swells and the testes enlarge in the male; in the female, the outer vagina contracts and the clitoris retracts.

Detailed explanation-4: -The four stages of the human sexual response cycle, as defined by Masters and Johnson (1966), are (1) excitement, (2) plateau, (3) orgasm, and (4) resolution.