The SUM TOTAL, and also a METHOD OF MEASURING something, say, by comparing and contrasting. With the second-most popular leisure time activities way back then being watching the grass grow while chanting or hacking up a small furry animal for lunch nuggets, it is likely that the foremost activity was the PLAN of choice:「foreplay to screwing, intercourse in rotation.」The most likely scene recalls the human proclivity for bonobo-like orgiastic melees, mixing some males with some females but not at all necessarily in an even ratio, and engaging in sexual foreplay with everyone in the group means the SUM TOTAL, and provides a METHOD OF MEASURING each on by comparing and contrasting. Within such a scenario there is a need to PLAN, to THINK LOGICALLY, to COMPUTE and REASON LOGICALLY, to mentally MEASURE WEIGHT and TIME, for everyone to GAUGE oneself, and so on and so forth.
　「Intercourse with ten, full intercourse」but note that the scene is not likely a single male with ten females, since such a scenario is an impossibility for even the most virile of human male specimens. One source states that the Dragon Emperor himself could only take six at a time, after determining by trial and error that a greater number in the bevy was superfluous, or wasteful, or encouraged excessively lesbian-like activities to pass the time of those waiting as spectators. A single female foreplaying with ten males is a definite possibility, as she is more than capable of handling all ten from a physical perspective, in repeated rounds no less just as any woman can attest, but also is unlikely as that 10:1 ratio would cause the impatient males simply to jerk off and walk away, or to jerk off one another.
　Some say this glyph means counting aloud in base-10 to a buddy, but not all folks used base-10 historically. It is also tempting to see these elements as「words needles speak」and equate them with an analogue meter of some sort to indicate measurement readings as was common in the past century. A gauge「speaks」to you with data and a「needle」pointing to a scale that is often divided into units of「ten」(not digital gauges as is commonly used today, an old-fashioned analogue version). While such an interpretation may be a convenient mnemonic, it fails to incorporate major meanings of PLAN and COMPUTE (「compute」is a fancy word for the old term to REASON LOGICALLY). Nevertheless, the biggest problem is that interpretation totally ignores the fact that not many folks in ancient China were walking around with gauges and meters a few thousand years ago (perhaps due to a lack of available AA batteries), hence, analogue metering was unlikely the intention of the sages.

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: to calculate; to compute; to count; to regard as important; to plan; ruse; meter; gauge
Japanese: plan, meter, measuring device, total, measurements, weighing, to measure, to weigh, to survey, to time, to conjecture, to infer, to surmise, arrangement, good offices, discretion, judgment, disposition, to manage, to arrange, to talk over, to dispose of, to be taken in
Unihan extended: plan, plot; stratagem; scheme
EDRDG: plot; plan; scheme; measure

Used within names (nanori)
え　･　かず　･　け