Human beings related by「head sliding, repeated penile emissions.」
　「The bonobo, an African ape closely related to humans, has an even bigger sexual appetite. Studies suggest 75 percent of bonobo sex is nonreproductive and that nearly all bonobos are bisexual.」　[　https://www.mentalfloss.com/posts/weird-animal-sex-facts 2023-05-44　]　
　「Like humans but unlike chimps and most other animals, bonobos separate sex from reproduction. They seem to treat sex as a pleasurable activity, and they rely on it as a sort of social glue, to make or break all sorts of relationships. 'Ancestral humans behaved like this,' proposes Frans de Waal, an ethologist at the Yerkes Regional Primate Research Center at Emory University. 'Later, when we developed the family system, the use of sex for this sort of purpose became more limited, mainly occurring within families [i.e., incest]. A lot of the things we see, like pedophilia and homosexuality, may be leftovers that some now consider unacceptable in our particular society.' 」
　　[　https://www.discovermagazine.com/mind/casual-sex-play-common-among-bonobos 2023-05-14　]　
　No species survives long without reproduction as the SYSTEM generating our HUMAN FAMILY, the family tree of HUMAN CONNECTIONS. See the original source glyph (繋, 'rotation of crotch sheath skin with stringy sticky threads'), literally as「repeated ejaculations」in a rotational sequence also helps form FAMILY MEMBERS and CONNECTIONS as these elements also represent, threads similar to INTERTWINED FAMILY LINEAGES that have continued in the East for literally thousands of years, more than 400 documented generations:「A genetic survey concludes that all Europeans living today are related to the same set of ancestors who lived 1,000 years ago. And you wouldn't have to go back much further to find that everyone in the world is related to each other」(all humans are descended from a single African woman, they say) 　[　https://cosmiclog.nbcnews.com/_news/2013/05/07/18107175-all-europeans-are-related-if-you-go-back-just-1000-years-scientists-say 2013-05-07　]　
　「Repeated」or「head, sliding」with long「silk fibers」meaning INTERTWINED, CONNECTIONS: silk cocoons are each spun from one single, long fiber, and understandably, silk caterpillars do not spin cocoons using a fiber having one standard length (…the caterpillars only have one chance in life, after all). Multiple fibers are twisted together with the drop spindle of a spinning wheel to form a single thread.「Repeating fibers」may describe the task of operating a drop spindle spinning wheel and constantly watch the fibers feeding into the spindle, and to CONNECT an additional,「repeating fiber」from a new cocoon each time a fiber ends, thus assuring that the continuous thread maintains the same relative strength and thickness throughout. The new fiber is simply pulled through a guide and then gently twisted around the other fibers forming the thread as soon as possible without stopping the wheel, and then naturally continues twisting with the other fibers into thread. A duty is thereby created for someone to be constantly watching for cocoon fibers that have ended and then add another. Allegorically indicates BEING CONNECTED in a SYSTEM with other people, activities, and responsibilities. Understanding the process for making thread from individual silk fibers using a spinning wheel adds depth to the analogy with human connections.

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 connect; to arrest; to worry; to tie; to fasten; to button up; to connect; to relate to; to tie up; to bind; to be (literary); system; department; faculty
Japanese: system, lineage, group, corollary, series
Unihan extended: system; line, link, connection
EDRDG: lineage; system