「Genital orifices with two taut erections」seems to suggest a service provider with one client in each foot, or, penetrating both the front and back sides, while she is STRETCHED TO THE FULLEST EXTENT and the clients are facing opposite one another with her perineum in the middle or her legs fully spread-eagle (depending upon access points).「Genitals, buttocks, taut and in a cooling process」also combine to mean shriveled and withered, NO MORE RESERVE, NONE REMAINING, EXHAUSTED, ALL USED UP as perhaps the threesome overdoing it a bit.
　Modern glyph uses elements meaning「prisoner/ slave genitals shackled together」(尺, 睪) with markers for「two.」Two prisoners tied by their genitals might eventually experience EXHAUSTION by simply walking in unison to avoid pulling off one set of genitals, and most certainly if trying to escape due to the difficulty in coordinating their respective movements while hurrying (a modern example may be three-legged sack races).
　Alternatively, if one of the bound prisoners becomes EXHAUSTED, with strength ALL USED UP to the FULLEST EXTENT, NO MORE RESERVE, NONE REMAINING and collapses, the result could very well have been the internal division of genitals for him and the「two tied in front and behind by the cojones」so in that situation one's nearby prisoners/ slaves were motivated to assist one another and keep the line moving.
　Another modern meaning is to MAKE A FRIEND…the obvious is also true, in that if these prisoners shackled together do not soon BECOME FRIENDS and cooperate, then they will not move at all.
　Elements also as「genitals leashed and coagulated, thickening, frigid」that more closely represents the original glyph of「hand on rod, shaft and pulling with multiple emissions and gauze netting used between spread legs for holding a poultice in place to draw out pus from an infected groin」perhaps depicts jerking out the clotted jism, blood, and pus with a bougie multiple times in an effort to promote healing until ALL USED UP to the FULLEST EXTENT, NO MORE RESERVE, NONE REMAINING (don't try that at home, though).
　Finally,「genitals taut with two, twice, in a cooling process」as WITHERED, SHRIVELED, ALL USED UP to the FULLEST EXTENT, NO MORE RESERVE, NONE REMAINING suggests two sessions in rapid succession that leaves one drained of energy, and all else.

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 use up; to exhaust; to end; to finish; to the utmost; exhausted; finished; to the limit (of sth); to the greatest extent; (when used before a noun of location) furthest or extreme; to be within the limits of; to give priority to
Japanese: last day, relying entirely on …, using solely …, with the sole purpose of …, based on, end, limit, extremity, altogether, all sorts of, all kinds of, to exhaust, to run out, to devote, to serve, to befriend, to do to exhaustion, to use completely, to use up, to exhaust somebody's civility, to give up, to be used up, to be run out, to be exhausted, to be consumed, to come to an end, unqualified, without exception, to wither, to fade, to shrivel, to pass one's prime, to start deteriorating, to begin to decline, eternal, everlasting, endless, enduring
Unihan extended: exhaust, use up; deplete
EDRDG: exhaust; use up; run out of; deplete; befriend; serve