「Woody, screwing emissions within an orifice」can most certainly be the cause of DISTRESS, TROUBLING WORRY, EMBARRASSMENT, QUANDARY or simple ANNOYANCE due to the conceivable conception complications of impregnation when gametes unite, and, the risk of contracting or passing along a communicably infectious disease, virus, parasite, fungus, bacteria or some other pathogen to a new host, hostess, or twinkie during a momentary lapse of reason.
　Or: a completely「enclosed tree」kept away from water and light will certainly soon become DISTRESSED, but it would need to be dug up and pulled from the soil first, and who would do that? and why? furthermore, most trees simply do not become troubled, worried, bothered, sleepy, or embarrassed (these are human traits, generally). Despite what some scholars claim, cutting down an actual tree and creating a stump in the soil does not enclose or surround either the roots or the freshly cut timber.
　A SIEGE「caused with a rod, screwing in a captive dependent」as it relates to any sort of sexual slavery can be the source of TROUBLE, DISTRESS, ATTACK and so on, not to mention subsequently becoming TIRED, SLEEPY after the struggle for all those so involved. In any case, clearly a「woody fully enclosed within mouth orifice」when a sex slave for life may not have had anything left to lose, and so might have chosen to use her/his last moments clenching in revenge to cause DISTRESS,「to cause the rod」of the lord/master/perp to become BESIEGED, UNDER ATTACK AND SURROUNDED, become a STUMP…see the glyphs meaning「teeth」and「fangs」(歯, 牙) for a fuller explanation, if you haven't already personally suffered the displeasure caused by a set of upper and lower incisors (that make 'incisions') severing meat.
　A thousand years ago, much more likely than boxing up literal trees, would be a「numb and unfeeling within an orifice」「woody isolated, enclosed」by a poultice codpiece that is DISTRESSED, BESIEGED, UNDER ATTACK AND SURROUNDED, and therefore must be the「cause, reason for woody to be kept quarantined」from use and not be permitted to infect others, or has already become a STUMP, to be STUMPED, TROUBLED about future life, DESTITUTE, WORRIED, and EMBARRASSED as a person in need of medical attention and at risk. A stump is the portion of something remaining after the main part has been cut away, broken, bitten off, or worn down and in a condition that leaves one not knowing what to do about it…perhaps the English expression 'being stumped' was derived from the same meaning as this glyph depicts, with the dreaded pox being a worldwide phenomenon back in the good ol' days prior to the availability of pharmaceuticals.

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: sleepy; tired; to trap; to surround; hard-pressed; stranded; destitute
Japanese: to be troubled, to be worried, to be bothered, to be embarrassed, to be stumped, to become exhausted, to trouble with questions, to embarrass, to put out, to put on the spot, to inconvenience
Unihan extended: to surround, besiege; to be surrounded; difficult
EDRDG: quandary; become distressed; annoyed