On a little reflection, though, the urethra as an object of erotic attention makes some sense.
So it turns out the urethra, which can be a source of great pain, can also bring great pleasure.
“For some people, life is just one long, hard kick in the urethra,” BoJack tells Charlie Rose.
"canal through which urine is discharged from the bladder," 1630s, from Late Latin urethra, from Greek ourethra "the passage for urine," coined by Hippocrates from ourein "to urinate," from ouron (see urine).
urethra u·re·thra (yu-rē'thrə)
n. pl. u·re·thras or u·re·thrae (-thrē)
The canal through which urine is discharged from the bladder in most mammals and through which semen is discharged in the male. Also called urogenital canal.
Plural urethras or urethrae (y-rē'thrē)
The duct through which urine passes from the bladder to the outside of the body in most mammals and some fish and birds. In males, the urethra passes through the penis and also serves as the duct for the release of sperm, which enter the urethra from the vas deferens.