Non-human primates aren't modest. Body functions and anatomical parts are just that. (While human males are less modest than females, even they wear a loin-covering of some type in tropical, stone age cultures.)
But not only is Chiquito immodest - he's carnal. Younger men are offered a monkey butt to groom. Older men are humped. And my armpits are sniffed and/or licked whenever the opportunity arises... which is frequently, because I wear sleeveless tops. (I wore shorts just once.)
Chiquito came to us at 22 months of age and his "eggs," as the Ticos call them, were noticeably smaller than they are now at almost three. But he won't attain sexual maturity for two or more years, at the age of five. Yikes?