http://en.wikipedia.org/wiki/Pelvis
The external anal and urethral sphincters close the anus and the urethra. The former is surrounded by the bulbospongiosuswhich narrows the vaginal introitus in females and surrounds the corpus spongiosum in males. Ischiocavernosus squeezes blood into the corpus cavernosum penis and clitoridis.
The external anal and urethral sphincters close the anus and the urethra. The former is surrounded by the bulbospongiosuswhich narrows the vaginal introitus in females and surrounds the corpus spongiosum in males. Ischiocavernosus squeezes blood into the corpus cavernosum penis and clitoridis.
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