[Source NSFW. Also "vaginal suction" what the shit]

Biological reason why Asian women are exclusively mating with White men.

For centuries, East Asian cultures procreated with no emphasis on female sexual gratification. As a collective culture, assertiveness, individuality, and aggression are frowned upon. Testosterone levels are generally low among the males as a way to facilitate harmony and cooperation, and thus, their primary mating strategy revolved around avoiding mating competitions and mate-guarding.
As a result, the women were kept sexually repressed, powerless, and submissive through imposed social norms. Women had little rights and often went through their entire lives with only one sexual partner. Without the need to compete with other males, these men were able to reproduce with relatively tiny penises and testes compared to the men of other races. Sex generally lasted only a few minutes and rarely pleasurable for the women since only the male orgasm is required for conception. Men thus, worried little about their physical sex appeal and only focused on advancing their social standing and financial success to secure mates. Over time, their bodies and faces evolved to be bare and devoid of most of its masculinity.
This mating strategy that involved collective self-emasculation and suppressing female sexuality worked for a long period of time, up until the day Western men were introduced to their society. Forged in a culture that celebrates individuality and aggression, Caucasian men have retained most of their virile qualities while also advancing further as a civilization. While the Asian man was being taught to avoid confrontation at all costs, the Caucasian man had already been practicing the mating game with other sexually aggressive males since his early teens. Along with the privilege and status the comes with being White male, the White man already put the Asian man at a severe disadvantage. Not only is the East Asian woman already conditioned to seek after higher status males, the White man also has an assortment of mating tools in his arsenal that Asian men do not possess.

For generations, sexually repressed Asian women rarely got to experience sexual arousal or climax as it wasn’t required to procreate in an Asian society. To the Asian female, sex is just a chore and often a painful one due to there being no lubrication from her lack of arousal. Generations of feeling sexually apathetic towards her men leave her helpless in the face of unfamiliar erotic desire The White man’s high status already coincides with her social value of seeking after successful men, but it’s his testosterone filled physique and attitude that makes her forsake all social stigmas imposed by the feeble Asian male and mate with the White man.
For once, her genitals become supple and wet, ready for penetration. Her vagina, which has only ever accommodated small Asian members, is extremely tight and virginal to the foreign man. Though she experiences tremendous pain as her White lover enters her, his larger phallus is able to stretch her out and reach orifices Asian men typically can’t, stimulating an array of unexplored nerve endings. He, in turn, introduces a multitude of erotic sensations completely foreign to her, making her experience immense pleasure from sex for the very first time.
The White man’s more sexually experienced background empowers him to delay his climax. His muscular physique from maintaining his sex appeal enables him to continue thrusting vigorously without tire. As he is doing this, his cock is acting as a suction piston, emptying the contents her vagina of any previous insemination. The longer and more rapid he thrusts, the more her vagina is sucked clean. His larger cock also makes him more effective at removal, leaving not a spec of the Asian man’s sperm behind. Her sexual repression and inexperience leave her easily overwhelmed by all the erotic sensations his cock is giving her, and before long she will have already achieved orgasm; an experience the majority of East Asian men are unable to give her.

Since the experienced White man is only competing with sexually incompetent men, it was incredibly easy for the White man to bring his sexually repressed Asian partner to climax. He, in turn, still has a lot of endurance leftover. While she has already reached her sexual peak, he still isn’t done relentlessly thrusting his cock inside her, pushing her to a brink of continuous, multiple orgasms. Liquid starts gushing out of her, something she did not know is possible. Her body begins to convulse uncontrollably, her already tight snatch spasms on his cock, finally making the White stallion ejaculate. His large cock is then able to ejaculate his semen directly to the top of her vagina, making them first in line to enter the cervix. His large gonads allow him to generate and deploy a large enough load to both impregnate her and still leave a large sum behind to block rivaling sperm from entering. His ability to make his partner climax also means her cervix will dip uncontrollably into his seminal pool, proactively drawing his sperm inside her.
Once she has mated with the White man, she will no longer desire to mate with an Asian male. This is unfortunately due to the fact that there is no biological purpose for her to do so. The Asian man’s mating strategy has been rendered obsolete in the face of foreign competition; his genitals simply aren’t equipped for competing with other men, much less foreign men. His tiny phallus won’t be able to reach deep enough to scoop out the White man’s deeply-planted sperms. His sexual inexperience prohibits him from thrusting for very long before ejaculating, making him unable to generate enough suction to displace the White man’s seminal pool. His gonads, which is two-fold smaller, only produces half the number of spermatozoa as White men. His small penis won’t be able to deploy his sperm directly to the top of her vagina either, leaving his small army of swimmers to be blocked from entering the cervix by the large remnants of the Caucasian man’s load that he was unable to displace. Due to the absence of his partner’s orgasm, her cervix won’t dip into his seminal pool. Instead, her lack of arousal makes her vagina dry and inhospitable, giving his already smaller army of sperms even less of a chance to fight through to the cervix. This essentially renders the whole act of mating with the Asian male pointless. Even in the event where the Asian male mated first, her sexual frustration from his inadequate performance will lead her to seek out a Caucasian male, who will in turn empty the contents of her vagina of his inferior sperm.
Though procreation isn’t on the mind of any of these individuals, the White man’s superior mating abilities are what causes the Asian woman to start longing for sexually competent males. He, in turn, compromises the East Asian male’s primary mating strategy, which involves collectively emasculating themselves and keeping their women sexually repressed to avoid sexual competition with one another. This essentially completely backfires, handicapping themselves against the sexually competent White men who also tower over them in social standing. Even if they wanted to change, their bodies and faces have already evolved to be devoid of most of its masculinity, making them the least sexually desirable among women of all races including their own. Unable to escape their genetics, they will forever be resigned to the fate of watching over half of their women mate exclusively with White men.