Noun
pubococcygeus
English Wikipedia has an article on:pubococcygeusWikipedia
(anatomy) A hammocklike muscle, found in both sexes, that stretches from the pubic bone to the coccyx; it controls urine flow and contracts during orgasm.
For example, the 30% reduction in size of the vagina could help clench onto the penis (much like, or perhaps caused by, the pubococcygeus muscles ), which would make it more stimulating for the male (thus ensuring faster or more voluminous ejaculation). Source: Internet
Pubococcygeus muscles are the ones you’re flexing to stop urinating. Source: Internet
It is a conditioned reflex of the pubococcygeus muscle, and is sometimes referred to as the PC muscle. Source: Internet