By Master and Johnson's definition, men are not capable of achieving multiple orgasms because they enter a refractory period following ejaculation.

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According to Masters and Johnson's research, men typically experience a refractory period after ejaculation during which they are not able to achieve another orgasm, distinguishing their sexual response from that of many women who may be capable of multiple orgasms without such a period.

By Master and Johnson's Definition, Men Are Not Capable of Achieving