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Text replace - "[[Copulation_-Sperm_in_the_Female_Tract_- Anatomy & Physiology" to "[[Sperm in the Female Tract - Anatomy & Physiology"
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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.   
 
* 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.   
 
* 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 & Physiology|semen in the female reproductive tract]].
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* Erection of the penis is necessary for copulation and deposition of [[Sperm in the Female Tract - Anatomy & Physiology|semen in the female reproductive tract]].
 
* Erection is characterized by a marked increase in rigidity of the penis.
 
* Erection is characterized by a marked increase in rigidity of the penis.
 
* Increased rigidity is the result of increase in arterial inflow of blood compared to venous outflow.
 
* Increased rigidity is the result of increase in arterial inflow of blood compared to venous outflow.
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