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The perineum corresponds to the outlet of the pelvis. Its deep boundaries are—in front, the pubic arch and the arcuate ligament of the pubis ; behind, the tip of the coccyx; and on either side the inferior rami of the pubis and ischium , and the sacrotuberous ligament . The space is somewhat lozenge-shaped and is limited on the surface of the body by the scrotum (in males) or the vulva (in females) in front, by the buttocks behind, and laterally by the medial side of the thigh. A line drawn transversely across in front of the ischial tuberosities divides the space into two portions. The posterior contains the termination of the anal canal and is known as the anal region; the anterior, which contains the external urogenital organs, is termed the urogenital region.
The muscles of the perineum may therefore be divided into two groups:
The perineum is sometimes referred to by the slang term 'tain't (also spelled taint), where 'tain't is a colloquial contraction of "it ain't." It has come to be a term for the perineum, from its use in the phrase, "'tain't pussy and 'tain't asshole." However, both men and women possess a perineum. Grundle, baunch, biffin, and chode are other common nicknames. Johnny Knoxville from Jackass used the term gooch for the perineum in the opening part of . It is also referred to as 'No man's land'.