If a「fluid flow」from the「nozzle in front precedes, before, prior to, anticipatory of」any activity, that is a sure symptom of an ongoing infection requiring the person to BATHE, the NEED TO WASH, particularly if greenish or yellowish in color and emitting a noticeably strong aroma. A need to INVESTIGATE further, prior to proceeding with an engagement by performing due diligence for the prevention of an infection spreading to oneself, or to simply run away: PRIM refers to strict and proper moral behavior, in this case associated with contracting a dose of the clap, or not.「Emphasis on frozen in fear, dripping front nozzle」as a cause for alarm and THE NEED TO BATHE.
Fundamentally:「flowing fluids and informed about copulation」as in to WASH, BECOME CLEAN both before, and after, undertaking some action that might cause the transmission of bacteria, pathogens, or 'germs' to another person, or within oneself, such as cleansing one's hands prior to eating with them, or touching food, cleaning anything that will be placed within one's mouth or other orifice lined with mucous membrane.
「Flow」「precede, before, first」also referring to some action that has already occurred (first) and now requires a person to WASH, BECOME CLEAN, a preceding action that necessitates washing to become clean again because of becoming fouled, described by the elements as「fluid flow with head sliding in fecal copulation.」Chinese sages would likely have used the foulest example known to be sure the point was understood fully by all, and a closer examination of the source elements may describe exactly what is in need of washing and why.
「Fluids flowing with copulation withdrawal」that needs no further explanation. Some sources add the meaning INVESTIGATE, related to「coming clean」by confessing all during an interrogation, or, simply performing an inspection whilst washing first.
「In traditional Chinese medicine, there has never been a mental disease called pedophilia (or an equivalent term), or homosexuality, or most of the other so-called sexual variations for that matter.」
[ https://docx2.com/wp-content/uploads/Are-Any-of-the-Pharaphilias-in-DSM-Mental-Disorders_.pdf 2023-05-14 ]
So wash up after tupping that ewe, too…yep, better to WASH before dozing off. Note that it was unlikely anyone in China, or most anywhere else, cared much about washing prior to depositing fluids with head in night soil copulation, but on the contrary, most would have wanted to at least rinse a bit afterward.
「Emphasis on cold, frozen with dread, congealed nozzle, head copulating in soil」and so on, causing the NEED TO BATHE, WASH, BECOME CLEAN and doing so often, but especially「before and after fluid flows.」

External source definitions …excluding politically incorrect concepts and other meanings deemed offensive today; may include extended definitions, euphemisms, and mnemonics)
Chinese: to wash; to bathe; to develop (photo)
Japanese EDRDG: wash, inquire into, probe
Unihan extended: wash, rinse; clean, purify

Used within names (nanori)
あらい　･　らい