This leads me to say a few words on what I have called sexual selection.

This form of selection depends, not on a struggle for existence in relation to other organic beings or to external conditions, but on a struggle between the individuals of one sex, generally the males, for the possession of the other sex.

The result is not death to the unsuccessful competitor, but few or no offspring.

Sexual selection is, therefore, less rigorous than natural selection.

Generally, the most vigorous males, those which are best fitted for their places in nature, will leave most progeny.