general

Men’s urethras differ from women’s urethras in that surrounding the male urethra, just below the meatus or opening, lies an embedded ring of extremely tough tissue that strongly resists stretching, and that below this ring the male urethra uniquely widens to form a tiny bulb-like chamber, medically known as the fossa navicularis, that lies within the glans and can comfortably hold large objects without needing to dilate or stretch, effectively making the tough ring of tissue surrounding the urethra at its terminus seem like a constriction.