when a penis becomes erect, it does so because the tissues have filled with blood and have hardened the shaft and head of the penis. blood flows out of these tissues after orgasm. at the tip of the penis is the glans, or head, which has the largest concentration of nerve endings and is easily stimulated; it can be very sensitive after orgasm. the head is shaped like a bulb, and if the guy is uncircumcised, will emerge from the foreskin when aroused.
the corpora cavernosa are two cylindrical tissues that run the length of either side of the penis. they are like sponges that soak up and hold blood when the cock becomes erect. as the tunica stretches, it blocks off the veins that allow blood to flow away from the corpora cavernosa. this traps blood in the penis where the pressure becomes high and the penis becomes erect. muscles in the pelvic floor contract around the base of the penis and keep it hard, which explains how cockrings work--they help both the tunica and the pelvic floor keep blood in the penis from flowing back into the body.
the most sensitive part of the penis is usually the area right beneath the head of the cock, ranging from just beneath the urethral opening to the circumcision scar. for the uncircumcised it is the same area, running from the urethral opening to where the inner skin of the foreskin's hood joins the outer skin of the penis.
when a penis becomes erect, it does so because the tissues have filled with blood and have hardened the shaft and head of the penis. blood flows out of these tissues after orgasm. at the tip of the penis is the glans, or head, which has the largest concentration of nerve endings and is easily stimulated; it can be very sensitive after orgasm. the head is shaped like a bulb, and if the guy is uncircumcised, will emerge from the foreskin when aroused.
the corpora cavernosa are two cylindrical tissues that run the length of either side of the penis. they are like sponges that soak up and hold blood when the cock becomes erect. as the tunica stretches, it blocks off the veins that allow blood to flow away from the corpora cavernosa. this traps blood in the penis where the pressure becomes high and the penis becomes erect. muscles in the pelvic floor contract around the base of the penis and keep it hard, which explains how cockrings work--they help both the tunica and the pelvic floor keep blood in the penis from flowing back into the body. 
the most sensitive part of the penis is usually the area right beneath the head of the cock, ranging from just beneath the urethral opening to the circumcision scar. for the uncircumcised it is the same area, running from the urethral opening to where the inner skin of the foreskin's hood joins the outer skin of the penis.
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