「Preferring the calm and peace」of「being tipsy and copulating alone」for many is the PERFECT ENDING, COMPLETE and IN NEED OF NO MORE.
Elements as「original, the first time, sourced at home」「deliberately out-of-reach and two squatting together at home under their own roof copulating」and「rather, a preference for, caused to become erect, being within a vestibule with a hairless place, bald spot」are suggestive of one's first such experience in dynastic China, something akin to 'incest is best':「In traditional Chinese medicine, there has never been a mental disease called pedophilia (or an equivalent term), or homosexuality, or most of the other so-called sexual variations for that matter. …Children are usually described as natural sexual beings and erotic stimulation and sex-play are seen as beneficial to their healthy development.」
[ https://docx2.com/wp-content/uploads/Are-Any-of-the-Pharaphilias-in-DSM-Mental-Disorders_.pdf 2023-05-14 ]
「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 ]
「Historical accounts from the 18th century indicate that adult-child sex (particularly same-sex pairings) were an accepted practice in China, Japan, Africa, Turkey, Arabia, Egypt, and the Islamic areas of India (Trumbach, 1977). In 19th century London the going price for a virginal, 12-year-old girl, of good background, was reported to be 400 pounds (Bullough, 1964).」
[ https://www.ipce.info/library/journal-article/legal-social-and-biological-definitions-pedophilia 2012-01-01 ]
「In Japan, it is not uncommon for mothers to sexually stimulate their children to soothe them so they will sleep. There have been stories in the press of mother-son incest arising from the strong nature of this relationship in Japan and the important maternal role of ensuring the son succeeds at school. According to Hideo Tokuoka, 'When Americans think of incest, they think of fathers and daughters. In Japan one thinks of mothers and sons' due to the extensive media coverage of mother-son incest there.」
[ https://en.wikipedia.org/wiki/Incest 2012-08-21 ]

External source definitions …excluding politically incorrect concepts and other meanings deemed offensive today; may include extended definitions, euphemisms, and mnemonics)
Chinese: to finish; to be over; whole; complete; entire
Japanese EDRDG: perfect, completion, end
Unihan extended: complete, finish, settle; whole