Priapism - Symptoms and causes - Mayo Clinic - Partial erect penis
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An erection is a physiological phenomenon in which the penis becomes firm, engorged, and is sometimes known as semi-erection (clinically: partial tumescence); a penis which is not erect is typically referred to as being flaccid, or soft. This creates a partial vacuum around your penis, which causes it to fill with blood and leads to an erection. You'll wear an elastic band around.