「Pestle pounding on all sides」in order to CONFIRM RELIABILITY and ASSURE a FIRM, STABLE base in soil, clay, rock and so on.
　「Stones, rocks that are surrounded and out-of-reach while in mating stance」describes the TIGHT, SOLID, HARD positioning of the testicles when pulled up FIRMLY against the torso by a contracted scrotum caused by a series of muscle rings of the tunica dartos (dartos fascia), neither loose nor dangling dangerously, an AUTHENTIC sign of male sexual arousal that is both RELIABLE and ASSURED (…or, a sign of really cold weather). See 确 as「rocks and horny.」
　Wrapped and「surrounded on all sides」up to one's「testicles, stone, rocks」while「in mating stance, person palming prick」with「high ambitions for one's pestle」may be describing the Chinese practice of using no-longer-integrated feet for male masturbation, initially believe to be the panacea solution to halt the spread of sexually transmitted infections and to halt the unauthorized flight of the service provider sex slaves of the shaman: AUTHENTIC, RELIABLE, TIGHT, a BACK-UP PLAN or SAFETY for all parties concerned…see 确「rocks with a horn.」
　「Pestle, rock shaped like person palming his prick that is surrounded on all sides and covered」as RELIABLE, ASSURED, FIRM, TIGHT and so on relate to the likelihood of achieving a satisfactory outcome during and after use of the tool for self-pleasuring (see 慥 as 'deep feeling of physical shape, motions of herd asset with orifice'). Dildos are also not likely to need to change mates as often as a male human being, likening a stone dildo as a mate to a crane, as a mate for reliability, and always being there when you really need 'em.
　「Stones」and「crane」: cranes are a symbol of long life and do not socially change mates too often, likened to rock-SOLID strength and RELIABILITY. Cranes mate for a long time, not sexually with the same bird for their entire life, but they do remain with one mate socially for long periods…social mating and sexual mating are not the same thing, for birds or for humans. Long life and not changing social mates too often with「rock-solid, reliable」perhaps leads to the meaning of ASSURANCE, a BACK-UP PLAN or SAFETY VALVE in the case that the first-line system fails.「Pliny the Elder [a Roman naturalist author] wrote that cranes would appoint one of their number to stand guard while they slept. The sentry would hold a stone in its claw, so that if it fell asleep it would drop the stone and waken.」
　　[　https://en.wikipedia.org/wiki/Crane_%28bird%29 2012-12-29　]　 whether Pliny the Elder and the Chinese sages had access to the same information is unknown, but in any case they probably had access to the same species of cranes, and it would seem old Pliny had some sort of basis for his statement or he would not have written it, enabling the other cranes to RELY UPON the sentry for ASSURANCE to CONFIRM their collective safety, with a「rock and crane.」
　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.

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: authenticated; solid; firm; real; true
Japanese: certain, definite, certainly, sure, if I'm not mistaken, if I remember correctly, for sure, distinctly, clearly, exactly, firmly, tightly, securely, strongly, solidly, sturdily, steadily, properly, well, sufficiently, hard, reliably, dependably, levelheadedly, shrewdly, wisely, cleverly, surely, confirmation, certification, ascertainment, to ascertain, to check, to make sure
Unihan extended: sure, certain; real, true
EDRDG: assurance; firm; tight; hard; solid; confirm; clear; evident