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人类的性反应,从性欲开始被唤起(即达到生理和心理上的性兴奋状态)到重新平复,经历着一个基本过程,即性反应周期。它划分为四个阶段,即:兴奋期、持续期、性高潮期、消退期。兴奋期,是指性欲被唤起(简称性唤起),身体开始呈现紧张状态的阶段。兴奋期内人体会发生许多生理变化,如心率加快、肌肉紧张、生殖器充血等。在男性,阴茎会因充血而勃起,但勃起反应的时间则因年龄而异。年轻男子无论在何种形式的性刺激下,均可使阴茎在3～5秒钟内由松弛状态达到完全性勃起。年龄
Human sexual response, from the beginning of sexual desire is evoked (that is, to reach the state of physical and psychological sexual excitement) to regain, go through a basic process, that is, the cycle of sexual response. It is divided into four stages, namely: excitement period, duration, orgasm period, regression period. Excitement, refers to the sexual arousal is evoked (referred to as sexual arousal), the body began to show tension in the stage. During the excitement of the human body will occur many physiological changes, such as heart rate, muscle tension, genital congestion and so on. In men, the penis erects due to congestion, but the time of erection varies according to age. Young men no matter what form of sexual stimulation, can make the penis in 3 to 5 seconds from the relaxed state to achieve complete erection. age