uncutting:

The frenulum of the penis is a small strip of skin that connects the underside of the glans to the foreskin. Some colloquially call it a “banjo string.”

Many people with a fully or partially intact frenulum say it is one of the most (if not THE most) sexually sensitive part of their penis. Sadly, most styles of circumcision remove part of all of the frenulum.

Aside from pleasure, the purpose of the frenulum is to help keep the foreskin covering the glans, particularly when flaccid.

Sometimes, the frenulum is a tad too short for the penis in a condition known as frenulum breve, and movement of the foreskin is restricted as a result. If it’s to the point of discomfort or interference with sexual activity (i.e., one “snapping his banjo string- ouch!), there are procedures that can fix this. A frenuloplasty is a minor surgery that should fix this, but if not, a frenulectomy (complete removal of the frenulum), while unfortunate, should do the trick. Circumcision is often recommended in cases of frenulum breve, but this level of destruction is hardly needed.