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The male sexual response starts from arousal followed by stimulation until the climacteric stage or orgasm and then the resolution and ends with the refractory period. The arousal or stimulation stage is characterized by a gradual increase in size of the penis or the copulatory organ of the male. Other physiologic changes include increase in heart rate and cardiac output, increase in respiratory rate and tidal volume of every breathe. Sweating and slight increase in temperature may also occur. This continues until the orgasmic stage or climax which is the most important stage of the male sexual response.It is of course the climax or orgasm wherein maximum erection occurs and ejaculation or delivery of the male genetic material and sexual fluids also known as ejaculate to the female organ of copulation which is the vagina. The resolution follows which is characterized by a gradual return of all physiological parameters to normal or pre-arousal levels. In contrast to the absence in the female of a refractory period, the male’s refractory period is defined as the stage for the male from the time complete resolution is achieved to the time another arousal can occur.

The anti-impotency or erectile dysfunction drugs affect all stages of the male sexual response in different degrees but its most important effect is on the arousal and stimulation stage. Viagra, also known as Sildenafil citrate and Levitra increases the blood flow to the penis during arousal and stimulation and thus produces an effective erection which makes penetration possible. Want to try it? Buy Sildenafil or buy Levitra online and learn for yourself.