Intrasexual selection is a form of natural selection where individuals of the same sex compete for access to mates. This competition often involves physical confrontations, displays of strength, or other behaviors that demonstrate dominance. The winners of these contests are more likely to attract mates and pass on their genes. This process is commonly observed in many animal species, including deer and lions, where males may fight for territory or display impressive features like antlers or manes. Intrasexual selection can lead to the evolution of traits that enhance an individual's chances of winning these competitions and securing reproductive success.