The reasons are too obvious to be retailed.
Now, then, knowing that the racial contribution of the sexually moral is
greater than that of the sexually immoral, we may compare the quality of
the sexually moral and immoral, to get the evolutionary effect.
For this purpose a distinction must be made between the individual who
has been chaste till the normal time of marriage and whose sexual life
is truly monogamous, and that abnormal group who remain chaste and
celibate to an advanced age. These last are not moral in the last
analysis, if they have valuable and needed traits and are fertile,
because in the long run their failure to reproduce affects adversely the
welfare of their group. While the race suffers through the failure of
many of these individuals to contribute progeny, probably this does not
happen, so far as males are concerned, as much as might be supposed, for
such individuals are often innately defective in their instincts or, in
the case of disappointed lovers, have a badly proportioned emotional
equipment, since it leads them into a position so obviously opposed to
race interests.
But, to pass to the essential comparison, that between the sexually
immoral and the sexually moral as limited above, it is necessary first
of all to decide whether monogamy is a desirable and presumably
permanent feature of human society.
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