AlphaMAN XL When a character is sexually aroused, mental indications factors the valves of each penile reservoir to enhance enabling blood circulation to pour into these swollen chambers. The chambers are fixed in situation via utilizing connective, sponge-like tissue and as they swell by the use of stress from inside of, the male reproductive organ turns into erect and difficult. Stress detectors regulate the amount of circulation, and steadiness the erection, and measure of stress. Afterwards when that man has ejaculated, the muscle relaxes.