The penis is the male sexual organ. It consist of two main parts. Shaft is the longest part of it, the head or glans is at the end of the shaft. The opening at the tip of the head, where urine and semen flow through, is called the meatus.
In the shaft there are two cylinder-shaped tube called corpus cavernosa. When the blood vessels of the corpora cavernosa open up, blood gets in through the cavernosus arteries to fill them. The blood then gets trapped under high pressure, creating an erection but of course an erection starts in your brain. Anything you sense ( saw, felt, smelled, heard, or thought) makes your nerves sends chemical messages to the blood vessels in your penis.
There are three stages to an erection:
- Soft or flaccid penis: This is the penis’s “normal” state, and it occurs when there is no sexual arousal or stimulation via sight, touch, or fantasizing.
- Swollen penis: When the brain and nerves are stimulated, the blood vessels and other tissue of the penis alter, allowing more blood to flow into the penis than out. During this stage, the penis begins to enlarge.
- Erect penis: As the visual, imagined, or tactile stimulation continues, the penis becomes erect. The brain and nerves keep sending more blood to the penis while restricting blood flow away from it. Manual stimulation or vaginal, anal, or oral sex is possible once the penis is completely erect.
If you are having problems, erectile dysfunction can be cured by few methods: