Pelvic brim

Superior view, posterior side is at the top of the pictures

The adult male pelvis is on your left. The adult female pelvis is on your right. The pelvic brim or inlet of a prepubescent female and a normal male will be heart shaped. This has led some people to conclude that a male's heart is in his pelvis! The pelvic brim or inlet of a normal postpubescent female is oval, being wider than it is deep. The change comes about due to hormones and it is functionally important because it facilitates birth of children.