This results in increased pressure, which prevents blood from flowing out of the penis and causes an erection. Instead, the penis is composed of three sponge-like cylindrical chambers, which gradually fill with blood when you feel aroused. The penis isn’t a muscle or boneĬontrary to popular belief, the penis isn’t actually a bone or a muscle at all. Erections can happen earlyĪlthough it hasn’t been studied in detail, it’s believed that fetal erections can be caused by contractions of the pelvic muscles and changes in blood flow.Īccording to one 2020 review, fetal erections are especially common during the third trimester of pregnancy and can occur an average of 1-3 times per hour. According to the United Kingdom’s National Health Service, one-third of penile fracture cases are attributed to sexual intercourse where the partner is on top. It’s not like a broken bone, though - instead, the blood vessels within the penis burst, causing painful swelling. But many medical professionals say that it’s completely normal. It’s not completely understood why this happens. People with penises may have 3-5 erections per nightĪ person with a penis typically has 3-5 erections per night during rapid eye movement (REM) sleep. Here are a few facts about erections that could be useful to know. If you’re a person with a penis, you may be wondering if the erections (or lack of erections) you’re experiencing are typical. These facts about erections may or may not surprise you, but they certainly are interesting.
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