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{{REF}}
Add video section.
# the condition of becoming rigid and elevated, as erectile tissue when filled with blood.
# especially the swelling and rigidity that occur in the [[Corpus cavernosum penis|two corpora cavernosa and corpus spongiosum]] of the [[penis]] as a result of sexual or other types of stimulation. Impulses received by the nervous system stimulate a flow of blood from the arteries leading to the [[penis]], where the erectile tissue fills with blood, and the penis becomes firm and erect. Erection makes possible the transmission of [[semen ]] into the body of the female. Erection can also occur to some extent in the [[clitoris]] and the nipples of the female.<ref>{{REFweb
|url=https://medical-dictionary.thefreedictionary.com/erection
|title=Erection
</gallery>
[[Circumcised]] males may experience tight and/or painful erections if there is insufficient residual shaft [[skin]] to permit full expansion and extension of the shaft of the [[penis]] during erection. [[Tissue expansion]] may relieve the pain and tightness.== Video===== How does an erection occur in men ? ===<youtube>v=52vH6gDUVI8</youtube>{{REF}}
[[Category:Medical term]]
[[Category:Male sexuality]]
[[Category:Physiology]]