I'm betting on the bonobos. Bonobos use sex, constantly, as their means of social communication. I don't mean once in awhile, I mean hundreds of times a day. Male-female, female-female, male-male, child-mother, child-father: all sex, all the time, among bonobos.
So, they should be checking the genital lice of the bonobos.
Bonobos are a subspecies of chimpanzee. They don't get panty crickets.