The corpus cavernosa are the two spongy chambers along each side of
the shaft of the penis. When you have an erection, the smooth muscle in these
chambers relaxes, blood flows in through the penile arteries, and the chambers
fill with blood and expand. The expanded chambers press against the veins that
would normally drain blood from the penis, trapping the blood inside and making
the penis erect.
After ejaculation or when you are no longer sexually aroused, the
arteries narrow, the veins expand, and the blood drains out. The penis becomes
A subject like erectile dysfunction is bound to be surrounded with as much legend as fact when it comes to causes and treatments. Check out these six common myths about ED and the facts to dispel the rumors.