「Foot motion like horse」could be referring to an obstinate horse or mule that simply will not cooperate, being difficult to manage, control, or subdue and standing stiffly straight up while the handler must hold the reins and take many steps. And, while perverse can refer to being perverted, it also means 'obstinately persisting in a self-willed or stubborn manner.' So with this glyph, OBSTINATE and PERVERSE are synonyms.
　「Motions with dildo」refers to a female unwilling to relinquish control of her dildo, noting that in ancient China dildo usage was common and even encouraged, not believed to be perverted, and not the least bit embarrassing as it has become within some circles today (horses masturbate quite regularly. See 馬 for details): females obstinately persisting in a SELF-WILLED MANNER or ATTITUDE with「motions of a stud, pestle, meat masher, and horsing around, behaving as do horses.」
　「Motions screwing, intersecting while prostrate」was PERVERSE from the Chinese point of view, since the 'normal' positioning was lordosis on bottom and coitus more ferarum rear-penetration dog-like position on top…the religious missionaries introduced the Christian deity's take on human sexuality with their「screwing intersecting while prostrate」preaching the god-ordained OBSTINATE only-one-way permitted dogma, obstinately persisting and insisting on this self-willed or stubborn manner.
　「Motions with feet while horsing masturbation」necessarily entail the use of someone else's feet, likely pre-no-longer-integrated, and then horsing around as was popular until fairly recently in China by OBSTINATE and PERVERSE brothel clients.
　Without a doubt, the Irish also have knowledge of their own to pass along in these trying times:「Masturbation will not spread coronavirus, especially if you wash your hands (and any sex toys) with soap and water for at least 20 seconds before and after.」Nonetheless and regrettably, unlike in dynastic China, it must be undertaken alone to truly be a preventative countermeasure but still achieve the desired result with some degree of safety.
　 　[　https://www.sexualwellbeing.ie/sexual-health/sex-and-coronavirus/ 2020-03-31　]　
　The Dutch, too have the same solution—it seems masturbation has become mainstream in the media the world over due to the coronavirus (it has always been 'the main stream' in reality, albeit covertly for most folks):
　「'Don't have sex with your partner if they have been isolated because of (suspected) coronavirus infection,' the RVIM says. 'Sex with yourself or with others at a distance is possible (think of telling erotic stories, masturbating together).'」
　　[　https://www.theguardian.com/world/2020/may/15/dutch-official-advice-to-single-people-find-a-sex-buddy-for-lockdown-coronavirus 2020-05-16　]　
　Needless to point out perhaps, but Chinese shamans from antiquity hit upon the same solution as a pandemic preventative countermeasure, honed for ultimate client satisfaction by utilizing naked females with no-longer-integrated feet as masturbatory sex buddies available for short-term rental with erotic visualization of live prepubescent female genitalia engaging in autoerotic stimulation herself, as a solution to the same problem facing us now, but in pre-Internet days.

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: obstinate, perverse
Unihan extended: obstinate, perverse
EDRDG: obstinate; perverse