Refers to WHATEVER OCCURRED or OCCURS FIRST with elements「changing status with copulation」that is caused by prepaying the fee with a UNIT OF MONEY.「Two copulating」as the original act causing the source of most animal reproduction, and the original source of bartering (money came later, actually). The PRIMARY activity contemplated by males from adolescence until death, and in fact is the sole SOURCE and ORIGIN of every human being's life, our FORMER, ORIGINAL state of being as a union of gametes, ovum and spermatozoon as「two copulating」or「rod with a momentary lapse of reason.」Reproduction is the PRIME DIRECTIVE encoded into the DNA of all males of most any species in fact. Elements depict the cause of originating a human life, after rolling and tumbling due to「one segment, a rod」with a「momentary lapse of reason, tipsy」as WHAT OCCURS FIRST (all else follows later).
Undeniably, the first UNIT OF MONEY traded amongst human beings was arguably describable as「two copulating」since seashells were not anywhere near as practical, or desired. …human copulation was, and remains today, imperfect as a unit of money for some obvious reasons, but will still do in a pinch. Therefore,「two copulating」whilst participating in the world's oldest profession again describes the SOURCE and ORIGIN of the need and use of UNITS OF MONEY to function as a medium of exchange, as a store of value, as a unit to measure relative values comparatively, and as a method of deferring payment, all of which enabled the development of contractual relationships, commerce, religion, and prostitution, compromising one's principles for personal gain in one way or another, with the love of money historically labelled as the root of all evil. The English term 'prostitute' is derived from one who is 'exposed, public, causing to stand erect' for what that's worth. PRIMAL instincts of the human male to crave sex and the human female to crave security (or, better health insurance coverage) form the basis of the SOURCE and ORIGIN of UNITS OF MONEY: two copulating, rod with a momentary lapse of reason, the need for and use of MONEY.

External source definitions …excluding politically incorrect concepts and other meanings deemed offensive today; may include extended definitions, euphemisms, and mnemonics)
Chinese: unit of money (in PRC: Chinese yuan, in USA: dollar, etc); primary; first; the Yuan or Mongol dynasty (1279-1368)
Japanese EDRDG: beginning, former time, origin
Unihan extended: first; dollar; origin; head

Used within names (nanori)
ちか　･　はじめ　･　はる　･　ゆき　･　よし