Simply stated as「prick ejaculating」and nothing else, with WHITISH jism spurting directly out of the meatus is the RAWEST, MOST BASIC, ELEMENTAL, NATURAL STATE, LEAST REFINED and also UNCHANGED, UNADULTERATED, ORIGIN of the species, FOUNDATION of life, PRIME directive, the BASIC PRINCIPLE of all life on this planet: ESSENTIALLY to reproduce the species. Note that other 'raw' glyphs also use elements of 'prick head' (生) and 'thread-like meat emissions, getting lucky' (綃).
If indeed the given external definitions refer to silk threads moments after having been spun onto the inner walls of soft cocoon encasements of slippery meat in the process of metamorphosis, the closest similarity could easily be to what forms constantly within a groin poultice of a gonorrhea patient. Caterpillars form cocoons from a single fiber of silk that is very fine but long, perhaps 1,000 meters in length and twisted into 300,000 figure-eight shapes over a period of about three days, during which the animal does not rest and continuously emits fluids from its spinneret. All this clearly as a comparison to a penile meatus with gleet discharges into batting, or, one's underwear if any:「threads with prick.」Be sure to also see 綃 (「penile emissions with rod meat spurting up」) that also means RAW SILK in Chinese.
Alternatively, as the favorite food of silk-producing caterpillars, mulberry trees grow low to the ground with drooping branches when not tended from a young age, so low that mulberry trees are sometimes referred to using the misnomer 'mulberry bushes' in English. Some say these elements are「droopy」(notwithstanding the shape of the upper element lacks any drooping) with「silk threads」referring to the initial stage of the process of producing silk, meaning the MOST BASIC, ELEMENTAL, NATURAL STATE, LEAST FINE and also UNCHANGED, UNADULTERATED, ORIGIN, FOUNDATION, PRIME, in RAWEST FORM, the BASIC PRINCIPLE. Unfortunately, untreated, unprocessed cocoons cannot be used as silk, and are not 'raw silk':「…[Initially, harvested silk] is quite a gummy, sticky substance, so before separating the filaments the cocoons must be softened by immersion in hot water to loosen the gum. Raw silk is typically a short fiber silk recycled from spinning silk. In the production of mulberry silk only a certain middle section of the cocoon can be unreeled for spinning [into fine silk]. The waste silk is the [raw silk] and it has a smooth feel with some bumps and a low luster. [Raw silk] taken directly from the filature is too fine to be woven. Before it is woven into fabric, it goes through a series of operations which conditions [it] for the loom. They do this by hand-reeling the threads onto a wooden spindle to produce a uniform strand of raw silk. [Raw silk] is typically a short fiber silk recycled from spinning silk and has a strong odor [it stinks] due to impurities in the yarn.」
[ link now-dead was www.thaisilkmagic.com/What-is-Raw-Silk 2012-12-10 ]

External source definitions …excluding politically incorrect concepts and other meanings deemed offensive today; may include extended definitions, euphemisms, and mnemonics)
Chinese: raw silk; white; plain, unadorned; vegetarian (food); essence; nature; element; constituent; usually; always; ever
Japanese EDRDG: elementary, principle, naked, uncovered
Unihan extended: white (silk); plain; vegetarian; formerly; normally