「Hair too long with repeated head bobbing lines of motion, rod with fluid stream」describes one of the reasons still today that many folks of both sexes remove groin pubic hair, that is, to enable oral sex to be more enjoyable for the service provider: TO BE BALD, HAIRLESS. Moreover,「hair loose and dripping, trimmed for benefit, to perform functions well」describes a methodology used by service providers in the caves o' wonder for grooming to reduce the spread of pubic lice crabs and other problems by shaving the affected area. Shaven crotches also had a noticeable effect upon increasing revenues too, it was quickly discovered, and helped solve the problems of itchy and scratchy spots with scabbing, and infections such as impetigo and furunculosis:「Itchy red spots in the pubic hair region may be a sign of a pubic lice infection, also called crabs. Lice droppings can leave a dark-coloured powder on your skin or underwear. Blue spots, caused by lice bites, may appear on your skin. You may notice empty lice eggshells, which look like tiny white oval dots, attached to the base of your hairs.」
[ https://www.nhsinform.scot/illnesses-and-conditions/sexual-and-reproductive/pubic-lice 2023-05-18 ]
Other given meanings relate to「hair」and「reaped, trimmed」to mean a shaved head, bald and scabby. FAVUS is a「chronic skin infection, usually of the scalp, caused by fungi of the genus Trichophyton and characterized by the development of thick, yellow crusts over the hair follicles.」
[ https://www.thefreedictionary.com/FAVUS 2013-10-30 ]
Shaving one's head helped slow down the spread of FAVUS, providing a benefit.
「The uncomplicated appearance is that of a number of yellowish, circular, cup-shaped crusts (scutula) grouped in patches like a piece of honeycomb, each about the size of a split pea, with a hair projecting in the center. These increase in size and become crusted over, so that the characteristic lesion can only be seen round the edge of the scab. A mousy odour is often present. Growth continues to take place for several months, when scab and scutulum come away, leaving a shining bare patch destitute of hair. The disease is essentially chronic, lasting from ten to twenty years. It is caused by the growth of a fungus, and pathologically is the reaction of the tissues to the growth. …Up until the advent of modern therapies, favus was widespread worldwide.」
[ https://en.wikipedia.org/wiki/Favus 2013-10-30 ]

External source definitions …excluding politically incorrect concepts and other meanings deemed offensive today; may include extended definitions, euphemisms, and mnemonics)
Chinese: bald; scabby
Japanese EDRDG: favus
Unihan extended: favus