In conclusion, I must deal with a matter which seems to have caused you uneasiness, namely, the _moral_ question. Among our patients we see many so-called immoral tendencies, therefore the thought involuntarily forces itself upon the psychotherapist as to how things would go if all these desires were to be gratified. You will have discerned already from my earlier letters that these desires must not be estimated too literally. As a rule it is rather a matter of unmeasured and exaggerated demands, arising out of the patient's stored-up libido, which have usurped a prominent position, usually quite against his own wish. In most cases the canalisation of the libido for the fulfilment of life's simple duties, suffices to reduce these exaggerated desires to zero. But in some cases it must be recognised that such "immoral" tendencies are in no way removed by analysis; on the contrary, they appear more often and more clearly, hence it becomes plain that they belong to the individual's biological duties. And this is particularly true of certain sexual claims, whose aim is an individual valuation of sexuality. This is not a question for pathology, it is a social question of to-day which peremptorily demands an ethical solution. For many it is a biological duty to work for the solution of this question, to discover some sort of practical solution. (Nature, it is well known, does not content herself with theories.) To-day we have no real sexual morality, only a legal attitude towards sexuality; just as the early Middle Ages had no genuine morality for financial transactions, but only prejudices and a legal standpoint. We are not yet sufficiently advanced in the domain of free sexual activity to distinguish between a moral and an immoral relationship. We have a clear expression of this in the customary treatment, or rather ill-treatment, of unmarried motherhood. For a great deal of sickening hypocrisy, for the high tide of prostitution, and for the prevalence of sexual diseases, we may thank both our barbarous, undifferentiated legal judgments about the sexual situation, and our inability to develop a finer moral perception of the immense psychologic differences that may exist in free sexual activity.