Today may be different, but in the old days, when a「straight up erection becomes bent, gnarled and twisted」it was difficult to deny at that point the bearer had been engaging in COPULATION. Even today, the teachings are that 'one does not contract an infection from a toilet seat—unless one copulates with a toilet seat.' Perhaps,「bent short leg」would be correct for this element. Note that "retroflex" means bent, curved, or turned backward.
　「Erection, quick movement」with「penis」depicting COPULATION. Reference to one's SON suggests one of the results of copulation (the son), and/or the imagination and activities of any young male offspring, generally. This element is often substituted for「emit, split」(ハ) and often associated with emissions of one sort or another (in life, too) as EMISSIONS DOWNWARD (see 貝 and 見 used as elements, for example). Also used to depict that someone's feet have been amputated, either as a punishment, or, for medical reasons such as the feet became gangrenous due to over-tightening the cloth bindings after dis-integrating the bones.
　As NOT WALKING, might entail being too young to walk, injured and too lame to walk, feet too no-longer-integrated or recently no-longer-integrated, too old to walk, too amazed or excited to walk away, too stubborn or determined to walk away, squatting while being engaged in human sexual activity, squatting while being engaged in excretory activity, participating in a crap shoot, stirring coals, picking up shells at the beach, changing a diaper or a poultice, tupping a ewe, peering into a supper cauldron, stirring a supper cauldron, conducting a self-examination, conducting an examination of another person, and so on.
　Elements may also be「straight up」with「kneeling」so something in between those two positions might be imagined as SQUATTING…nonetheless, in spite of given meanings, if used to represent a leg in some sense rather than simply copulation, the elements「erection bent, curved penis」most likely refers to only ONE BENT LEG: a Chinese euphemism for the penis is「short leg, third leg」and if a past or present dose of gonorrhea has occurred, the penis will often be bent as in the English epithet,「get bent!.」
　As LEG RADICAL, perhaps the scholars are admitting tacitly that the dynastic Chinese copulated with no-longer-integrated legs…no set of legs looking as do these elements could be much good for anything else, in particular the ends of those legs…see dynastic Chinese erotic art for a pictoral explanation.

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: non-syllabic diminutive suffix; retroflex final; son
Unihan extended: son, child
EDRDG: legs radical (no. 10)