A「farting orgy」is simply distasteful, and proper etiquette dictates POSTPONING flatulent releases, when possible.「Farting at an orgy」effectively causes immediate SPREADING OUT of participants to OPEN UP breathing space, PROLONGING the activities by causing a POSTPONEMENT…all out defecation needs no explanation.
　All species of primate females, including lemurs, lorises, monkeys, apes in estrus (and humans at times, such as during ovulation) still overtly perform the action depicted by these elements: proceptivity (a.k.a. 'come, and get it').「Buttocks layered, one on top of another and cooperating」with「comparison shopping」as SPREADING and EXHIBITING, perhaps for sale or for short-term, single-use as a one-off endeavor, but much more likely as a PROLONGED group activity. Note the older form of this same glyph used「many, many flesh seams」with「buttocks, genitals」for「concubine comparisons」(㞡).
　Meanings of OPEN UP, to BE EFFECTIVE, and either to POSTPONE exit or to PROLONG a stay. In this case, the shopper's paradise being depicted is likely what today might be referred to as a 'booty-call parade' or 'bootylicious mooning dance' during which a gaggle of folks looking for either courtship or employment bend over and DISPLAY their SPREAD meat while OPENING UP, altogether quite an EFFECTIVE MEANS of attracting attention (try it sometime and see for yourself), not unlike the oldest forms of folk dancing and modern pole dancing establishments. Elements literally depict「buttocks cooperating with multiple upward thrusting and a tangle of people.」Remember that any glyph containing the「buttocks, corpse, genitals」element is likely related in some way to a buttocks, or to a corpse, or to genitalia.

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 spread out; to open up; to exhibit; to put into effect; to postpone; to prolong; exhibition
Japanese: exhibition, to open, to unfold, to spread out, to unroll, to unwrap, to lay out, to make, to stretch, to widen
Unihan extended: open, unfold; stretch, extend
EDRDG: unfold; expand

Used within names (nanori)
のぶ　･　のり　･　ひろ　･　ゆき