(The urethra, by the way, is entirely surrounded by the prostate think of it “like a fleshy straw running through a small orange,” Dr. Horwitz explains, adds “enzymes, zinc, citric acid, and other nutrients” to semen’s formula, which is designed to “support sperm cells on their long journey” out of the penis through the urethra. Together, that adds up to semen, the “white-gray, thicker fluid” that comes out of the penis tip during ejaculation and is composed of sugar, mucous, vitamins, and protein. The prostate gland, along with the seminal vesicles attached to its back, create a fluid that mixes with sperm that's made in the testicles. Horwitz describes it - we move into the territory of internal penis parts. With the prostate - a “walnut-shaped gland that sits under the bladder,” as Dr. ![]() We’ve already covered the different external penis parts. That said, if the curve of a penis worsens or if erections become painful, says Dr. Horwitz says, which is often totally normal and more visible when the penis is erect (or hard). ![]() Some people might also notice a “slight curve or lean” to their penis, Dr. Horwitz says, is probably “on the lower end of that range.”Īs for penis shapes, some are wider, others are narrower. That means they may not actually be representative of all penis sizes the true average, Dr. Rainey Horwitz, MD, MS, a urology resident physician at Emory University and a sex educator, points out that even studies meant to determine average penis size - 5.1-5.5 inches, according to a 2020 review¹ of several studies - shouldn’t be taken for undisputed truth because many studies feature participants who voluntarily chose to have their penis size measured. Almost every ding-dong out there will contain the parts shown in this penis diagram, but it’s important to remember that, as with vagina anatomy, the penis comes in different shapes and sizes.
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