Abstract: Sexual selection encompasses a theory of : (1) intrasexual selection, whereby members of one sex compete with each other for access to the other sex; (2) inter-sexual selection, whereby individual of one sex choose which the individual of the other sex to take as mates. In this paper, sexual selection is examined, with particular emphasis on: (1) intrasexual selection and intersexual selection; (2) good genes and mate choice; (3) learning and mate choice in cowbird; (4) cultural transmission and mate choice.

Key words: sexual selection, intrasexual selection, intersexual selection, good gene, learning mate choice