Before revision: Role in sexual selection
After revision: Sexual selection is a process of natural selection in which individuals of one sex choose to mate with individuals of the other sex based on certain observable characteristics (intersexual selection, the exaggerated tail in peacocks, for example) or they compete with other individuals of the same sex for access to mating opportunities with individuals of the opposite sex (intrasexual selection, as when males of certain mammalian species fight for the right to mate).Role in sexual selection