In Japan, service providers engaged in the sex trades or as bar hostesses are said to be in the「water business」(水商売):「stringy human connection threads of white water」or the「water with a concluded contract for services」describes clients with a one-track mind, seeking a DIRECT ROUTE, a TRACK laid down previously with no straying or wrong-turns possible. Note that locomotives on rail tracks generally are not equipped with steering handles or wheels, and race tracks to not permit the runners or drivers to select their own courses.
　A STRIA (plural: striae) is one of a parallel set of lines of some material, such as mineral striation in geology, or muscle fibers in anatomy. BEAMS and RAYS, such as those composed of photons in lasers and light ray gun sights provide a direct, unwavering path to follow.
　A fixed POLICY or PRINCIPLES that allows for no deviations, such as that of hygiene laid down by shamans for service providers, mandating a DIRECT ROUTE, TRACK to the wash basins in order cleanse the IMPRESSION THAT REMAINED, the AIR ONE GIVES OFF (attempting to eliminate chunks, the smell, and perhaps some bacteria). Service providers perambulating to the wash water area and back again to one's work station would also lay down a slick TRACK, TRAIL of prints from no-longer-integrated feet that could be followed, the impression that remained giving off a smell in the air「covering the surroundings.」Interestingly, near the gates of Japanese temples and shrines, wash basins are placed at the entrances/exits, often with the glyph 心 (spewing appendage) carved into the front, and a dragon (Chinese euphemism for one's snake-like appendage) overlooking the water, all reminders in the old days to wash oneself prior to and after contact [note to tourists: in most cases, Japanese shrines and temples no longer offer public access to service providers, although they do still accept coin money donations].
　「Ejaculate」and「white small stream, the fountainheads」(heads with a fountain) create the PATHWAY, the ROUTE to「wealth and money」the shaman's business plan, a TRACK from which many males cannot deviate, nor could many females of dynastic China but for a different reason. And as crass as it seems, surely some sages suggested also TRACKS that were literally the accumulated seminal discharges of various clients into a service provider's no-longer-integrated feet flowing down her two legs to her backside forming definite, visible TRACKS, LINES, a PATHWAY, STRIPES, her PRINCIPLE purpose, the impression one leaves, the air one gives off, and so on.「…conspicuous white ejaculate water」recalling that 水 as a glyph itself is comprised of「stream of fluids between no-longer-integrated feet of sitting service provider」creating striae down the back of each leg, a TRACK that is followed naturally by successive flows, and the material to wash off after the completed contract.

Modern definitions (that generally disregard history) …excluding politically incorrect concepts and other meanings deemed offensive today; may list only pigeonholed definitions, euphemisms, or meaningless mnemonics)
Chinese: thread; string; wire; line
Japanese: line, stripe, stria, wire, ray, beam, track, route, lane, outline, contours, form, level, division, position, approach, policy, principle, impression one leaves, air one gives off
Unihan extended: thread, line, wire; clue
EDRDG: line; track