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The frenulum is a highly erogenous, V-shaped structure on the underside of the glans that connects the glans to the ventral inner foreskin.

When the foreskin is retracted and then released, such as when an erection subsides, the frenulum provides a pulling force that helps the foreskin extend over the glans.

During circumcision, the frenulum is either excised with the foreskin or severed, which destroys or diminishes its sexual and physiological functions. (The term frenum refers to all similar structures, but more commonly to connective tissues like the band under the tongue. Frenulum refers specifically to smaller frenum)

View of ventral side of glans penis showing an intact frenulumSide view of glans penis showing an intact frenulum

Source: Frenulum. (2009, September 27). In Wikipedia, The Free Encyclopedia. Retrieved 01:11, October 7, 2009