「Emissions (doubled)」or marked twice for extreme emphasis, to mean MANY EMISSIONS. Not coincidentally, eerily similar to 心 and 必. See the Used-In glyphs meaning gas, hero, doing repeatedly, drop or spot, martyr, fumigate, boast, bastard, melena, internally ruptured, having no more, contentment, slipper, embarrassment, banana, flashing, tilling soil and so on that all have absolutely nothing to do with either tails or fire despite externally given meanings and teachings. Nevertheless, MANY EMISSIONS can be linked both to「flaming」sensations and to「tail」meat, flaming with or in a tail, and perhaps that is how these associations began. MANY EMISSIONS maps cleanly onto "external fertilization" of any variety, nonetheless pheromone-triggered milt release into the water column by fishes, which is apparently reflexive spawning and perhaps not autoerotic in any meaningful sense as far as humans can understand the mind and sensations of fish.
External sources associate this element with being on fire, heated, burning, calling it the 'fire radical,' and indeed it is since the fire glyph itself (火) is formed by「adult male emissions」or as「emphasis on erection, in pursuit of sitting person, service provider.」Fire, flaming, and combustion have been associated with MANY EMISSIONS from time immemorial, as are areas surrounding a tail with all sorts of emissions. Internal combustion engines with pounding steel pistons (鉄) inside lubricated sleeves cause many emissions from fire through the tailpipe…allusions not merely allegorical in nature.
Some sources explain this element as 'tail,' but significantly, 灬 is part of only these few glyphs that refer to animals: horses and unicorns, fishes, birds, lambs, bears, and various traits of humans of course. …while many more animals than these possess tails, the animals listed other than fish have very little actual muscle meat on the tail (reserving any comment regarding one-horned animals) with the tail generally unremarkable. So, does 灬 truly refer to a tail? notwithstanding external references, this element 灬 in each of the above cases (other than the unicorn) refers not to a tail, but instead to that specific animal's extraordinary MANY EMISSIONS that are remarkable in some respect: stallions masturbate repeatedly about every hour or two throughout each day (see 馬), fishes ejaculate after merely sensing female pheromones in the surrounding water even when no females are present (see 魚), birds excrete waste at least once an hour (see 鳥), and bears are herculean copulators (see 熊) —of course in the case of lambs, the reference is to emissions while someone is with that animal and not those of the ewe lamb herself (mostly).
Finally, recall from geometry class that a repeating line of dots, drops is an array of points (灬), and in fact simplified Chinese uses both ー and 一 to replace an array or 'line of drops, MANY EMISSIONS' that can also be one result of REPEATEDLY BOBBING with a HEAD, either as ejaculate or as vomit, and in some cases, excrement.
Without a doubt, the Irish also have knowledge of their own to pass along in these trying times:「Masturbation will not spread coronavirus, especially if you wash your hands (and any sex toys) with soap and water for at least 20 seconds before and after.」Nonetheless and regrettably, unlike in dynastic China, it must be undertaken alone to truly be a preventative countermeasure but still achieve the desired result with some degree of safety.
[ https://www.sexualwellbeing.ie/sexual-health/sex-and-coronavirus/ 2020-03-31 ]
The Dutch, too have the same solution—it seems masturbation has become mainstream in the media the world over due to the coronavirus (it has always been 'the main stream' in reality, albeit covertly for most folks):
「'Don't have sex with your partner if they have been isolated because of (suspected) coronavirus infection,' the RVIM says. 'Sex with yourself or with others at a distance is possible (think of telling erotic stories, masturbating together).'」
[ https://www.theguardian.com/world/2020/may/15/dutch-official-advice-to-single-people-find-a-sex-buddy-for-lockdown-coronavirus 2020-05-16 ]
Needless to point out perhaps, but Chinese shamans from antiquity hit upon the same solution as a pandemic preventative countermeasure, honed for ultimate client satisfaction by utilizing naked females with no-longer-integrated feet as masturbatory sex buddies available for short-term rental with erotic visualization of live prepubescent female genitalia engaging in autoerotic stimulation herself, as a solution to the same problem facing us now, but in pre-Internet days.

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