Eli5 Why do you need to call a doctor if your erection lasts longer than 4 hours after taking male enhancement medication?
In: 219
As to a caveman:
Penis get hard when big blood rush in.
Penis stay hard when big blood stay.
Blood stay one place too long, make big clot.
Big clot in penis mean no new blood get in.
No want big clot kill penis, no want big blood stay in penis too long.
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