So the sexed-linked behaviors of primates "in the wild" such as chimps is based on "appearance standards"? When it comes to "observable sex traits," the cues other primates rely on are principally visual? I though the old saw about primates across the board trading in smell for sight over the course of evolution has proven not to be true after all.

Primates, including humans, are usually thought of as visual animals with reduced reliance on the sense of smell. In behavioral experiments, biologists have now found that chimpanzees use olfaction as a prime mode of investigation, and that they recognize group members and kin using olfactory cues.

Human scientists who've found that smell is chimps' "go-to" sense that they most rely on to observe other chimps "in the wild" have speculated that

"Odor might be especially important because most chimpanzees live in dense forests where visibility is low, and because in chimpanzee societies, group members split up into subgroups that may not see each other for days"

https://www.sciencedaily.com/releases/2018/10/181024083346.htm#:~:text=Primates%2C%20including%20humans%2C%20are%20usually,and%20kin%

It's interesting that you feel comfortable making generalizations about bonobos, particularly "in the wild," when primatologists call them "the forgotten ape" and most of what is known about them comes from observing them in captivity. Little is known about how they behave in their native habitat:

Wild bonobos can only be found in forests south of the Congo River in the Democratic Republic of Congo (DRC). Sometimes known as the pygmy chimpanzee, bonobos weren’t recognized as a separate species until 1929. As the last great ape to be scientifically described, much remains unknown about the bonobo—including the extent of its geographic range. Efforts to survey the species over the past two decades have been hampered by the remote nature of its habitat, the patchiness of their distribution and years of civil unrest within the DRC. https://www.worldwildlife.org/species/bonobo

What little research has been done on bonobos "in the wild" unfortunately has been done by human observers, such as wildlife photographer Frans de Waal, author of the 1998 book The Forgotten Ape, who to a man (LOL) have consistently projected their own feelings, perceptions and motivations onto bonobos, ascribing human characteristics and psychology to them. To wit:

When the lively, penetrating eyes lock with ours and challenge us to reveal who we are, we know right away that we are not looking at a "mere" animal, but at a creature of considerable intellect with a secure sense of its place in the world. We are meeting a member of the same tailless, flat-chasted, long-armed primate family to which we ourselves and only a handful of other species belong. We feel the age-old connection before we can stop to think, as people are wont to do, how different we are.

Bonobos will not let us indulge in this thought for long: in everything they do, they resemble us. A complaining youngster will pout his lips like an unhappy child or stretch out an open hand to beg for food. In the midst of sexual intercourse, a female may squeal with apparent pleasure. And at play, bonobos utter coarse laughs when their partners tickle their bellies or armpits. There is no escape, we are looking at an animal so akin to ourselves that the dividing line is seriously blurred.

https://archive.nytimes.com/www.nytimes.com/books/first/d/dewaal-bonobo.html

The attitude that human males like de Waal have toward bonobos is very similar to the attitude many men, particularly genderists, have towards women.