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* Stallion
 
* Stallion
* Increases in diameter during erection and [[Reproductive_Behaviour_-_Pre-copulatory_Behaviour_-_Anatomy_%26_Physiology#Penile_Protrusion|protrusion]].
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* Increases in diameter during erection.
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* '''Retractor penis muscle''' still relaxes during erection, but '''no sigmoid flexure'''.
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* Engorgement with blood plays a significant role in the highly vascular penis.
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