As a result of these factors, males are typically more willing to mate than females, and so females are typically the ones doing the choosing (except in cases of forced copulations, which can occur in certain species of primates, ducks, and others).
Como resultado destes factores, os machos tipicamente están máis desexosos de aparearse que as femias, e as femias son normalmente as que fan a elección (agás en casos de copulación forzada, que se poden dar nalgúns primates, patos e outros).