Final answer:
The resolution phase is the stage of the sexual response cycle where erection loss begins, and it follows the orgasm phase. It represents a return to the una_roused state and involves a refractory period for men.
Step-by-step explanation:
The phase in which erection loss begins is known as the resolution phase. This is the fourth phase of the sexual response cycle, characterized by a return to the una_roused state following orgasm. During this time, the body undergoes several changes, reversing the arousal process and allowing for muscular relaxation and a decrease in blood pressure. Notably, men experience a refractory period during the resolution phase, where they are unable to achieve an erection or ejaculate for a time ranging from minutes to hours.
During the orgasm phase or phase three of the sexual response cycle, both sexes undergo rhythmic involuntary muscle contractions. In males, this includes the constricting of reproductive accessory glands and tubules and the contraction of the urethra, which culminates in the ejaculation of semen through the p_enis.
The sexual response cycle comprises four main phases: excitement, plateau, orgasm, and resolution. These phases were categorized by Masters and Johnson and are observed to be fairly consistent across both men and women.