「Hands in stroking motions with shaft and with muck orifice」as TO PROVIDE ASSISTANCE, to MAKE CONTACT WITH, an ADJOINING CONNECTION, becoming LINKED IN with surrounding BORDERING organs, ADDING to what is already coming about with「screwing in blame」and「mucky wetland orifice for comparison.」Note that dual-headed dildoes are still as common and in use today as they were in dynastic China, and there are still plenty of nerve endings that surround the sensitive rectal orifice sphincter organ that are associated with the clitoris (see 豆 for details) and the prostate:
　「If we take a look at lifetime prevalence rates for anal sex, the numbers are even higher. For instance, a recent survey by the Centers for Disease Control revealed that 44% of men and 36% of women reported having had anal sex at least once in their lives. Like the NSSHB, this sample was also predominately heterosexual (94%). As you can see, anal sex is a quite popular activity among both men and women in America and it would appear that most Americans who have had anal sex are heterosexual.」
　　[　https://www.sexandpsychology.com/blog/2014/6/27/sex-question-friday-how-popular-is-anal-sex-in-america/ 2020-03-11　]　
　「Aside from stimulation within the vagina, many women find anal stimulation to be an enjoyable part of masturbation. Anal play is most often associated with men because it stimulates the prostate…」
　　[　https://www.dailydot.com/irl/how-do-women-masturbate/ 2020-03-11　]　
　「Rod in one's descendants」as BECOMING CONNECTED and perhaps TO ASSIST.「Screwing in blame, full blame」and「mucky wetland orifice of concubines, service providers」also depict HUMAN CONNECTIONS of one sort or another.
　Not likely related solely to farming rice, since sitting most of the time spent in wet paddy muck can be detrimental…nevertheless,「rice paddy」and「almost the same」applies to ADJOINING, BORDERING fields, in many cases. One wet area near another can supply needed irrigation and fertilizing slurry to assist with crops if the wetlands are connected, in much the same manner as one person sitting most of the time with no-longer-integrated feet can assist another same such person with clientele. The perineum adjoining wet orifices, with one side as a source of lubricating assistance for accessing the other:「muck-filled orifices of side-by-side sitting persons as service providers.」
　Also seems to depict「filled with blame」for one's neighbors or those across the border, a condition that seems fairly common among humanity worldwide, those who are「compared to a muck-filled orifice.」Rivalry with one's neighbors on any scale: personal, business, competitors, countries, and so on.「Blame the goods, blame the merchandise」suggests the grass is always greener in the neighbor's lawn. The adjoining rice paddy always seems more abundant. Thy neighbor's wife, concubine, or thy neighbor always seem more attractive than loving the one you are with, and so on.
　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: adjoin; border
Unihan extended: help, assist; connect, adjoin
EDRDG: help; assist