Moreover, and this not only supports my view but can be explained only by it, there are no inverts who are completely sexually inverted. In all of them there is from the beginning an inclination to both sexes; they are, in fact, bisexual. It may be that later on they may actively encourage a slight leaning towards one sex or the other, and so become practically unisexual either in the normal or in the inverted sense, or surrounding influence may bring about this result for them. But in such processes the fundamental bisexuality is never obliterated and may at any time give evidence of its suppressed presence.
Reference has often been made, and in recent years has increasingly been made, to the relation between homosexuality and the presence of bisexual rudiments in the embryonic stages of animals and plants. What is new in my view is that according to it, homo-sexuality cannot be regarded as an atavism or as due to arrested embryonic development, or incomplete differentiation of sex; it cannot be regarded as an anomaly of rare occurrence interpolating itself in customary complete separation of the sexes. Homo-sexuality is merely the sexual condition of these intermediate sexual forms that stretch from one ideally sexual condition to the other sexual condition. In my view all actual organisms have both homo-sexuality and heterosexuality.
That the rudiment of homo-sexuality, in however weak a form, exists in every human being, corresponding to the greater or smaller development of the characters of the opposite sex, is proved conclusively from the fact that in the adolescent stage, while there is still a considerable amount of undifferentiated sexuality, and before the internal secretions have exerted their stimulating force, passionate attachments with a sensual side are the rule amongst boys as well as amongst girls.
A person who retains from that age onwards a marked tendency to "friendship" with a person of his own sex must have a strong taint of the other sex in him. Those, however, are still more obviously intermediate sexual forms,
