Which Muscle is at the hyu yin point?

[thaddeus]

Hey, just looking at some anatomy charts..i did a quick google but couldn't find an answer...which muscle is the hyu yin located on. Is it the bulbocavernous muscle (on a male)..These muscles are different on a woman..for example, I read an interesting discussion on kegels..for males, the PC muscle is really the bulbocavernous muscle..for women, it's something else..but because it's such an awkward, unknown area, the term PC muscle is just thrown about..

thaddeus