1. How Does Erection Normally Happen? What Is An Erection?An erection is a complex event that requires the interaction of the brain, nerves, hormones, and blood vessels. This process is separate from ejaculation and orgasm, both of which can occur without an erect penis.The shaft of the normal penis consists of two erectile bodies, each called the corpus cavernosum(see diagram), which begin at the pelvic bone and extend to just below the head of the penis. They are spongy tissue made up of smooth muscle and blood vessels. The male hormone testosterone, which is secreted by the testicles, controls the function of the penis and a man's sex drive. Not proud with your current penis size? Click here for your FREE Male Penis Enhancement guide.

2. How Does Erection Normally Happen? The brain starts the changes that will produce an erection As a result of psychological or physical stimulation, the brain sends messages through the nervous system to the penis.

3. These messages relax the smooth muscles in the blood vessel walls of the corpus cavernosum, causing them to open wider.

4. When this happens, more blood flows through the vessels, filling the corpus cavernosum.