Interesting facts about Erections
There are a number of other interesting facts about erections.
Most apes have a bone, or baculum, to keep their penis erect, whereas humans rely solely on blood pressure.
Biologists do not know why humans selectively lost this trait, but walking upright with this bone may have become a little uncomfortable anyway.
Even a little tiny fetus can have an erection. Ultrasound tests have shown that it can happen in the third trimester.
Men have "spontaneous" erections during the day that have nothing to do with sexual arousal.
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Erections that occur while sleeping are common and a sign of a healthy penis – there is even a medical term for this: Nocturnal Penile Tumescence (NPT).
Men average about five of these erections per night.
NPT often occurs during REM sleep, where it’s believed the brain stops releasing a chemical that normally suppresses erections.
NPT also occurs when men have a full bladder – this may be a type of reflex erection or a mechanism to prevent urination while sleeping
A common slang term for the full bladder erection is “morning wood.”
NPTs are believed to contribute to penis health.
Although no formal studies have been published, based on astronauts’ accounts, it’s difficult – perhaps even impossible – for men to achieve an erection in space. Apparently, gravity plays a role.