Final answer:
The question's statement is false because it incorrectly defines intrasexual competition as intrasexual selection, and confuses intersexual selection with intrasexual selection. Intrasexual competition is about competition within the same sex, while intersexual selection relates to mate choices made by the opposite sex based on attractive traits.
Step-by-step explanation:
The statement posited in the question is false. Intrasexual competition involves conflict or contest among members of the same sex (often males) for mating opportunities. It often includes dominance battles and physical contests such as rams butting heads.
Intersexual selection, on the other hand, also known as mate choice, involves individuals of one sex (usually females) selecting mates based on certain desirable traits, which may include visual, auditory, and performance characteristics, like the vibrant plumage of male peacocks or the complex mating dances of some bird species. The secondary sexual characteristics that arise from these selections, while they may impact survival negatively, are those that are found attractive by the opposite sex and confer greater reproductive success to the individual possessing them.