Psychoanalysis has proven that all homosexuals, without exception, show heterosexual tendencies in early life. There is no exception to this rule. _There are no monosexual persons!_ The heterosexual period stretches far into puberty. _All persons are bisexual._ But persons repress either the homosexual or the heterosexual components on account of certain motives or because they are compelled by particular circumstances and consequently act as if they were monosexual. Even the “male hero” (_Maennerheld_) type and _Hirschfeld’s_ “genuine” homosexual is only apparently monosexual. A glance through the confessions disclosed by all writers is enough to convince one of this fact. _Hirschfeld_ himself points out that it is to the credit of psychoanalysis that it has revealed the transitory heterosexual cravings of the homosexual. _The instinct of the homosexual originally is not exclusively directed towards the same sex. Originally the homosexual is also bisexual._ But he represses his heterosexuality just as the heterosexual must repress his homosexuality. _Blüher_ who is unwilling to recognise a pathogenesis of homosexuality for the ‘male hero’ type, contends that one could claim with equal relevance that there is a pathogenesis of heterosexuality. That is a fact. Every monosexuality is other than normal or natural. _Nature has created us bisexual beings and requires us to act as bisexual beings._ The purely heterosexual is always a neurotic in a certain sense, that is, the repression of the homosexual components already creates a predisposition to neurosis, or is in itself a neurotic trait shared by every normal person. The psychology of paranoia, for whose investigation we are indebted to the genius of _Freud_, shows us the extreme result of this process of repression on one side, just as homosexuality shows us the other side of the same process. There is no homosexual who is not more or less neurotic, that condition being due to the repression of the heterosexuality. The repression is a purely psychic process and has nothing to do with degeneration. Homosexuality is not a product of degeneration in the ordinary sense. It is a neurosis and displays the etiology of a neurosis, as we shall prove later. I revert to _Hirschfeld_. Regarding the relationship of neurosis and homosexuality he states: “1. Pronounced physical and mental stigmata of degeneration are relatively rare among homosexual men and women; at any rate such signs are not more frequent in proportion to the total number of homosexuals than among the heterosexuals of both sexes. “2. On the other hand we find frequently and not merely as a result of homosexuality, _a greater instability of the nervous system_ (frequently shown in the periodic character of endogenous temperamental instability) (_endogene Stimmungsschwankungen_).