Five things you didn't know about your penis
3. Your penis is shaped like a boomerang
Your penis is shaped like a boomerang. Just like you don't see all of a big oak tree above ground, you don't see the root of your penis tucked up inside your pelvis and attached to your pubic bone.
In an MRI picture, the penis looks distinctly boomerang-like, as noted by a French researcher who studied men and women having sex inside an MRI scanner.
One method of surgical "penis enlargement" is to cut the ligament that holds the root of the penis up inside the pelvis. This operation may give some men a little extra length if more of the penis protrudes from the body, but there are side effects. This ligament, called the suspensory ligament, makes an erection sturdy. With that ligament cut, the erect penis loses its upward angle and it wobbles at the base. The lack of sturdiness can lead to injury.
4. You can break your penis
There is no "penis bone," but you can break your penis all the same. It's called penile fracture, and it's not a subtle injury. When it happens, there's an audible pop or snap. Then the penis turns black and blue. And there's terrible pain – and some explaining to do in A&E.
Penile fracture is rare, and it typically happens to younger men because their erections tend to be quite rigid.
Here's how to avoid penile fracture - don't use your penis too roughly. A common way that penile fracture happens is when a man is thrusting too hard and fast during sex, and slams into his partner's pubic bone. Also, a woman who moves wildly while on top of a man during sex can break a man's penis.
Peyronie's syndrome is a related condition that tends to show up more in older men. An older man's erection may not be as rigid, but still is hard enough for sex. Over time, if the penis bends too much a certain way during sex, small tears in the tissue can form scars, and the accumulated scar tissue gives the penis an abnormally curved shape.
Not all penis curvature is a problem, however. Experts say there is a lot of variability about what is normal.
No. 5: Most penises in the world are not circumcised
Circumcision is far less common in the UK than other parts of the world. A report by the World Health Organization (WHO) and the Joint United Nations Programme on HIV/AIDS (UNAIDS) estimates that worldwide only 30% of males aged 15 and over are circumcised.
It is usually carried out for religious or cultural reasons. In the UK, circumcision is only carried out on the NHS in cases where it is medically necessary.
There is some evidence that circumcision may have health benefits, including a decreased risk of urinary tract infections, some sexually transmitted infections, penile cancer and even prostate cancer.