HETERO is a word-forming element meaning「the other, different than the speaker」from Greek heteros「the other (of two), different, other than usual.」…modern English usage defines hetero- as 'only the other sex, never the same [homo-] sex.' Elements suggest learning that ANYTHING GOES sexually,「share and cooperate communally and orgiastically」:
　「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　]　
　Nearly all human males and females as the species emerged from other primates were bisexual, as are bonobos. A purely heterosexual human in dynastic China would have been STRANGE, UNUSUAL, and DIFFERENT from the norm, or, at least among a small minority, if we can believe all the glyphs taken together and integrated as a cultural menage…or perhaps, menagerie is a better term.
　「Filled orifice above multiple upward thrusting penises with emissions」to indicate being able to discern a DIFFERENCE in techniques, a STRANGE, UNUSUAL sensation in a DIFFERENT orifice, or with a DIFFERENT penis, enabling someone to become DISCRIMINATING with a preference for one, or the other. Alternatively,「both orifices plugged with emissions」that is, one in each orifice, may also cause a DIFFERENT, UNUSUAL, STRANGE sensation, a VARIATION on the usual theme, UNCOMMON, and cause someone to become DISCRIMINATING with a preference for one, or the other. Scholars say the glyph depicts walking around town with 'both hands holding some sort of a mask' (?), and these elements as 'rice paddy cooperation' do not fit the given meanings but in fact connote the opposite, since cooperation in rice paddies was essential.

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: different; other; hetero-; unusual; strange; surprising; to distinguish; to separate; to discriminate
Japanese: difference, strange, odd, unusual, different, extraordinary, different thing, other, exceptional, praiseworthy, laudable, outstandingly, extraordinarily, exceptionally, especially, particularly, unusually, above all, additionally, to differ, to vary, to disagree, unlike, unique, to make a distinction, to be different
Unihan extended: different, unusual, strange
EDRDG: uncommon; queerness; strangeness; wonderful; curious; unusual