The secrets of a good erection | ISUD - Erection for sex
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An erection is a physiological phenomenon in which the penis becomes firm, engorged, and enlarged. Penile erection is the result of a complex interaction of psychological, neural, vascular, and endocrine factors, and is often associated with sexual arousal or sexual. Erection problems do not usually affect your sex drive. Erection problems are common. Almost all adult men have trouble getting or keeping an.