Differences in reproductive success arising through access to mates or fertilizations. Conspicuous signals can diverge rapidly under sexual selection without equivalent divergence in the functions required for meiosis.
Behaviour influencing which potential partner contributes to reproduction. The opportunity to choose and the costs of searching constrain its expression.
Differential responsiveness to potential mates or mating cues. Preference must be distinguished from the realized mating pattern produced by encounter, competition and acceptance.
