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The body of the penis consists of three cylindrical-shaped masses of erectile tissue which run the length of the penis. Two of the masses lie alongside each other and end behind the head of the penis. The third mass lies underneath them. This latter mass contains the [[urethra]]. The penis terminates in an oval or cone-shaped body, the [[glans penis]], which contains the exterior opening of the [[urethra]].<ref name="farlex2003" />
The normal [[intact]] penis is enveloped by a tube of loose, highly innervated, movable, erogenous skin, the [[foreskin]] or prepuce, which enables it to expand freely during [[erection]]. The skin ends just behind the [[glans penis]] but folds forward to cover it, this forming the [[preputial sac]] and, if long enough, the [[acroposthion]]. The inner surface of the foreskin contains glands that secrete a lubricating fluid that mixes with exfoliated tissue to form preputial sac may harmlessly collect [[smegma]] , which contains oil, which makes it easy for the penis to expand is helpful in preventing dermatitis.<ref name="birley1993">{{REFjournal |last=Birley |init=HDL |author-link= |last2=Walker |init2=MM |author2-link= |last3=Luzzi |init3=GA |author3-link= |last4=Bell |init4=R |author4-link= |etal=yes |title=Clinical Features and retract past the [[foreskin]management of recurrent balanitis; association with atopy and genital washing] |trans-title= |language= |journal=Genitourin Med |location= |date=1993-10 |volume=69 |issue=5 |pages=400-3 |url=https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1195128/pdf/genitmed00029-0074.pdf |quote= |format=PDF |pubmedID=8244363 |pubmedCID=1195128 |DOI=10.1136/sti.69.5.400 |accessdate=2023-11-29}}</ref>
== Innervation ==
The penis — the organ of copulation — is heavily innervated with afferent<ref>{{REFweb