A member asked:

What causes erections?

A doctor has provided 1 answer
Dr. James Lin answered

Here are some...: All parts of biological body are magically designed and composed in such a way to function coherently so to survive, grow, continue, and procreate. For penis, through "perfect" coordination of nerves, blood vessels, and muscles, the blood is diverted into the chambers of penis with its outflow temporarily shut so to maintain its needed rigidity for coitus to procreate. More? Ask and study...

Answered 4/18/2018

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