In dynastic China, the wealthiest class representing money and coin all maintained harems of human meat as their chattel on the hoof, a select and limited group, a private sex circle of flowers in a garden: an「enclosure of fleshpots.」This arrangement mitigated the owner's or lord's risk of infection to a degree, as well as provided some other conveniences but not without a huge initial cost and continuing overhead.
Providing a「cockring with a fleshpot」was a favorite of the shaman in her caves o' wonder since the time-and-billing model in use generated considerable COIN MONEY over and above the standard three-minute schtupper.
Literally「enclosure of members」as「enclosure of orifices and fleshpots.」「Enclosure of round」「annulus money」as COINS that formerly were minted with a hole in the center (annulus: space between two concentric circles).「Enclosed members」perhaps meaning a members-only group or「circle」as the original glyph was「enclosure with orifice on fleshpot.」May have referred to a small, members-only group of the master's household with access to the harem, or, that performed gang-bang sex with someone tied to a fleshpot (see「dream」夢).
Perhaps one sharp-witted son-of-a-bitch/shaman figured out that they could charge a fee for access to「vulva, vortex within widely spread legs」(the modern replacement for this glyph) and collect MONEY, today known as「pimping」and like it or not most folks will admit that erotic Internet sites generate boatloads of MONEY.
Gold, silver and copper COINS were early forms of money since meat soon spoiled, fattened or aged, and people were not yet stupid enough to accept clam shells any longer, or paper IOUs from the government, or worse, ethereal, digitally-assigned electronic debits and credits. Note that some items used as commonly-accepted money function as both a store of value and as a medium of exchange, so using something besides literal raw meat that spoils or sexual services meat that must be enjoyed all at once and not saved for a rainy day does have a purpose within a society.
Modern replacement elements of「spread legs」and「vulva」depict the vaginal orifice, that is arguably also a「vortex」of some sort (particularly, the vaginal/ cloacal shape of some species of animals, such as ducks). Further note that scorpion burrows are actually shaped as downward spiralling vortices, and use a very similar glyph.
Coins and Japanese yen are also associated with this direct reference as a means of earning money, considering these elements and those also used in the glyphs meaning:「sell」「buy」「shop」「business」「trade」and so on, and so forth.

External source definitions …excluding politically incorrect concepts and other meanings deemed offensive today; may include extended definitions, euphemisms, and mnemonics)
Chinese: circle; round; circular; spherical; (of the moon) full; unit of Chinese currency (Yuan); tactful; to justify
Japanese EDRDG: yen, circle, round
Unihan extended: circle; round, circular; complete

Used within names (nanori)
つぶら