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The Mechanics Behind the Erection

 
The Mechanics Behind the Erection

An erection is caused by the relaxing of the arteries in the penis, which widen to allow more blood in, causing swelling.

This swelling puts pressure on the veins at the penis’ surface, trapping the blood and causing an erection.  




  
  

Love & Sex Editor
09/15/2006
Reader ranking:3.2/5 
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