A「rod and orifice rotten to the core」suggests the EXTREMES humans will go to in order to satisfy that primal urge for sex.
　「Die in obscurity with orifice and rod of crotch」suggests the manner in which many old folks actually die, becoming STIFFS…think about that scene. Moreover, in death, a male often experiences a STIFF WOODY POLE erection called a「priapism」(ask your mortician).
　A「woody」「repeatedly, frequently in extreme need」or「wood with one no-longer-integrated foot, an orifice of some kind, or a crotch」to mean ONE OAK-HARD, STIFF ERECT POLE, or THE MOST THAT CAN BE DONE, THE EXTREME.「Tree in extreme conditions of stress」as the extreme height of a mountain or near a pole of the Earth where no trees can grow and no trees are there due to severely stressful conditions, i.e., beyond the tree line. Note the various Japanese meanings of EXTREME EROTICISM and a CLIENT WITH PROSTITUTE from these elements.
　「A death erection, angel lust, or terminal erection is a post-mortem erection, technically a priapism, observed in the corpses of men who have been executed, particularly by hanging. The phenomenon has been attributed to pressure on the cerebellum created by the noose. Spinal cord injuries are known to be associated with priapism. Injuries to the cerebellum or spinal cord are often associated with priapism in living patients. Death by hanging, whether an execution or a suicide, has been observed to affect the genitals of both men and women. In women, the labia and clitoris will become engorged and there may be a discharge of blood from the vagina. In men, 'a more or less complete state of erection of the penis, with discharge of urine, mucus or prostatic fluid is a frequent occurrence…present in one case in three.' Other causes of death may also result in these effects, including fatal gunshot wounds to the brain, damage to major blood vessels, and violent death by poisoning. A postmortem priapism is an indicator that death was likely swift and violent.」
　　[　https://en.wikipedia.org/wiki/Death_erection 2013-09-26　]　

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: extremely; pole (geography, physics); utmost; top
Japanese: pole, climax, extreme, extremity, culmination, height, zenith, nadir, quite, very, 10^48, quindecillion, octillion, end, limit, acme, agreement, rule, contracted regular payment, regulation, settlement, conclusion, arrangement, habit, custom, countenance in front of another person, face, love relationship between a customer and a prostitute
Unihan extended: extreme, utmost, furthest, final
EDRDG: poles; settlement; conclusion; end; highest rank; electric poles; very; extremely; most; highly; 10**48