We conclude that it is:
1. Because it is spreading at the expense of polygamy even where not
favored by legal interference. The change is most evident in China.
2. In monogamy, sexual selection puts a premium on valuable traits of
character, rather than on mere personal beauty or ability to acquire
wealth; and
3. The greatest amount of happiness is produced by a monogamous system,
since in a polygamous society so many men must remain unmarried and so
many women are dissatisfied with having to share their mates with
others.
Assuming this, then adaptation to the condition of monogamous society
represents race progress. Such a race profits if those who do not comply
with its conditions make a deficient racial contribution. It follows
then that sexual immorality is eugenic in its result for the species and
that if all sexual immorality should cease, an important means of race
progress might be lost. An illustration is the case of the Negro in
America, whose failure to increase more rapidly in number is largely
attributable to the widespread sterility resulting from venereal
infection.[185] Should venereal diseases be eliminated, that race might
be expected to increase in numbers very much faster than the whites.
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