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dmson dmson
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6 years ago
The human penis becomes erect during sexual arousal because of
 
  a. a bone that protrudes into it
  b. blood filling it
  c. the urethra expanding
  d. muscles contracting and enlarging
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vkvk
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#1
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6 years ago
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dmson Author
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6 years ago
Good timing, thanks!
veronee_madison
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Yesterday
You make an excellent tutor!
alpheratz
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2 hours ago
Thanks
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