Another step up the evolutionary ladder we find the earthworm. Each worm has the organs of the two sexes--the equivalent of testes and ovaries,--properly developed, but each worm needs another worm to induce fertilization. In this instance, we have true hermaphroditism, and bisexuality is definitely established. However, as the two worms are of the same sex--each being male as well as female--they are in that way homosexual, as well, being attracted by worms of similar constitution. As life grows more complex and we ascend the biological scale, the sexual processes also become more ramified, until in the higher forms of life we find the sexual nature of the individuals of the different genera and species sharply differentiated. But even in the highest form of life, there are the vestigial organs and characters of the opposite sex, so that while the normal human being has a definite sexual category, it is just as truly apparent that no individual is wholly of one sexual character. The most masculine man is not one hundred per cent masculine, nor is the most feminine woman one hundred per cent feminine. The proof of this will be shown as we proceed in our discussion. The physical bisexual characters--those of the opposite sex being present in rudimentary form--are readily observable. In the male, there are the vestigial breasts and nipples, and other rudimentary features less prominent; and sometimes a general feminine contour of body is noticeable in the male. The most feminine of women have a growth of colorless hair, called the “lanugo,” corresponding to the male beard. If the woman has a larger proportion of masculine chemistry in her make-up, this hirsute growth may be quite prominent; and in some cases very pronounced, as in the instance of the bearded ladies who exhibit themselves in shows and circuses. Women with a more or less definite masculine cast of figure, movement, manner and voice are commonplace;--as is the opposite phenomenon--effeminate men. The psychological phases of bisexualism parallel the physical. We might even go farther and state they are more in evidence than the physical, as they are subject to modification by environmental influences to a degree far exceeding the physical. As was observed in the opening paragraph of this chapter, the individual may suffer a retardation or fixation at any stage of the sexual development, which holds him back into another and more primitive psychical and emotional level, which he has chronologically outgrown.