The buildup of sexual tension: Sexual arousal leads to the buildup of tension in the genital and pelvic areas. This tension is a result of increased blood flow to the genitals, leading to vasocongestion.
Elevation of arousal: As sexual stimulation continues, arousal intensifies. This involves an increased heart rate, breathing rate, and muscle tensions.
Orgasm reflex: As sexual stimulation reaches a certain threshold, the body initiates the orgasm reflex. This reflex is controlled by the central nervous system and involves a series of involuntary rhythmic contractions in the genital and pelvic muscles. Usually the pelvis thrusts in a forward position. These contractions can be intense and pleasurable.
Release of neurotransmitters: During orgasm, the brain releases a flood of various neurotransmitters, including dopamine and oxytocin. These chemicals contribute to intense feelings of pleasure and satisfaction associated with climax.
Resolution phase: After orgasm, the body enters the resolution phase. Heart rate, breathing, and blood pressure begin to return to their normal levels. Muscle tension in the pelvic area decreases.