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In Humans, During sexual arousal in males, his penis will get erected with blood.

Where does this new blood coming to fill his penis which is required for erection ?

V_NHJ
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    There are areas in our body which act as reservoir for blood , so when a body part needs excess of it can be diverted to it. ex: lungs. – JM97 Mar 07 '17 at 13:22
  • see this : http://biology.stackexchange.com/questions/20174/where-does-extra-blood-come-from-to-fill-your-muscles-during-exercise?noredirect=1&lq=1 – JM97 Mar 07 '17 at 14:21

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