It's perineum ...
... and only girls have them (peri = around, neum = newborn).

Write it out one hundred times and bring it to me in the showers at midnight.

Edit : This post is for humorous purposes only. Not to be used as an educational resource.
( lion-cake Bad lion-cake, bad., Tue 9 Jun 2009, 9:02, archived)

"In human anatomy, the perineum is generally defined as the surface region in both males and females between the pubic symphysis and the coccyx. "
(bogus official shove it up your cunt, Tue 9 Jun 2009, 9:06, archived)

Indeed.

( Esme Weatherwax I swear on my tash it's daycent hash, Tue 9 Jun 2009, 9:08, archived)