During which phase of the sexual response cycle does the refractory period begin?

Fourth phase, which is called resolution.

Explanation:

Fourth phase is the final phase of the sexual response cycle. It's the phase where the body slowly returns to its normal level of functions, and erect body parts turn back to their previous color and size. Men need to recover after intercourse and reached orgasm which is called a refractory period. During this period, they cannot reach an orgasm right after. The duration of refractory period depends, as every men is different, and it changes with age.

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