Did you sleep during biology class? Sexual dimorphism refers to the different morphological characteristics, like outward appearances, between the sexes within a species. Like how male birds are often more colorful than female birds.
Perhaps a misunderstanding due to societies recent attempt at broadening the concepts of sex and gender with the inclusion of social issues, which has the effect of mudding the waters of understanding and yields interpretations that vary widely as it strays away from science as its base.
I’ll stick with what can be tested, reproduced and proven when it comes to concrete subjects like sexuality. Utilizing truth does not magically solve the current social issues we face, but it does present a base that could achieve a much greater height for society as a whole.
It is sexual, because the big noses are supposed to be attractive to the female monkeys. It shows the male is healthy and thus worth it to reproduce with.