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== Erection ==
 
== Erection ==
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When sexual receptivity of the female is established and sufficient arousal is accomplished in the male, erection and protrusion of the penis ensue.  Successful penile erection requires a complex series of neural and vasomotor reactions.  Erection of the penis is necessary for copulation and deposition of semen in the female reproductive tract.
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When sexual receptivity of the female is established and sufficient arousal is accomplished in the male, erection and protrusion of the penis ensue.  Successful penile erection requires a complex series of neural and vasomotor reactions.  Erection of the penis is necessary for copulation and deposition of [[Copulation_-Sperm_in_the_Female_Tract_-_Anatomy_%26_Physiology|semen in the female reproductive tract]].
    
== Penile Protrusion ==
 
== Penile Protrusion ==
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