The scrotum has usually, in the human imagination, been regarded merely as an appendage of the penis, of secondary importance, although it is the garment of the primary and essential organs of sex, and the fact that it is not the seat of any voluptuous sensation has doubtless helped to confirm this position. Even the name is merely a mediæval perversion of _scortum_, skin or hide. In classic times it was usually called the pouch or purse. The importance of the testicles has not, however, been altogether ignored, as the very word _testis_ itself shows, for the _testis_ is simply the _witness_ of virility.[78] It is easy to understand why the penis should occupy this special place in man's thoughts as the supreme sexual organ. It is the one conspicuous and prominent portion of the sexual apparatus, while its aptitude for swelling and erecting itself involuntarily, under the influence of sexual emotion, gives it a peculiar and almost unique position in the body. At the same time it is the point at which, in the male body, all voluptuous sensation is concentrated, the only normal masculine center of sex.[79] It is not easy to find any correspondingly conspicuous symbol of sex in the sexual region of women. In the normal position nothing is visible but the peculiarly human cushion of fat picturesquely termed the Mons Veneris (because, as Palfyn said, all those who enroll themselves under the banner of Venus must necessarily scale it), and even that is veiled from view in the adult by the more or less bushy plantation of hair which grows upon it. A triangle of varyingly precise definition is thus formed at the lower apex of the trunk, and this would sometimes appear to have been regarded as a feminine symbol.[80] But the more usual and typical symbol of femininity is the idealized ring (by some savages drawn as a lozenge) of the vulvar opening--the _yoni_ corresponding to the masculine _lingam_--which is normally closed from view by the larger lips arising from beneath the shadow of the _mons_. It is a symbol that, like the masculine phallus, has a double meaning among primitive peoples and is sometimes used to call down a blessing and sometimes to invoke a curse.[81]