What is the main factor in intrasexual selection?

Intrasexual selection refers to the competition between individuals of the same sex, often males, for access to mates of the opposite sex. The primary driving force in this type of selection is the competition among males to showcase their traits, strength, or status to win over females. This competition often manifests in various forms, such as direct combat, displays of aggression, or other strategic behaviors that enhance an individual's chances of mating.

While competition for resources, parental investment, and attractiveness to peers can play important roles in the broader picture of sexual selection and mating strategies, the central focus of intrasexual selection specifically centers around males competing with one another to secure mating opportunities with females. The nature and intensity of this competition can lead to the evolution of specific traits that are advantageous for male success in securing mates.