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My partner is a B+ and I’m an A, and according to the blood type personality theory, we are a match made in hell. 

Apparently, blood type personalities have long been used by the Japanese and Koreans, and this fad has also found its way to Singapore, with some dating agencies here offering blood type dating services

It made me reevaluate my relationship, because there must be a reason why so many people are buying into this theory of blood type romantic compatibility.

One site explains that my husband and I are the worst match because as a blood type A, I, apparently, need to “be in control in order to have that sense of stability,” and the need for structure and control can “cause tension with Type B’s lively social nature.”

I guess in certain ways, I do like to be in control. It gives me the assurance that the world is in order. However, I am no dictator, and I struggle to think of what kind of a ‘structure and control’ I might have imposed on my partner that is causing ‘tension’ with his ‘lively social nature’—and what does this even mean?

Another site tells me that as a Type A, I envy my Type B partner’s “ability to enjoy things at their own pace.” However, my (Type B) partner “is uncomfortable with [my] doting.The kindness feels intrusive.”

I should be worried about this apparent lack of compatibility between my husband and I, especially since we have a long road ahead of us as newlyweds. Instead, I am trying to figure out what it means for ‘my doting and kindness’ to be intrusive.

I mean, I would have known, right? I would be truly alarmed and worried for the sanity of my partner if he has been quietly suffering from distress from kindness for more than four years. 

Despite not being able to make head or tail of the compatibility readings, it’s fascinating that blood type personalities have long been used by the Koreans and Japanese as a way to know each other and to find love. In a way, it is like their equivalent of our horoscopes. 

Also known as ketsueki-gata, the blood type personality theory specifies defining characteristics that is unique to each of the ABO blood types, and you can easily find a plethora of sites detailing the personalities of each blood type.

For example, Japanese site Tofugo describes Type As like me as being ‘well-organised’: “They like to keep things neat but can be stubborn and get stressed out easily. They also value harmony with others.”

The personality traits of a Type A
Screen Capture taken from Tofugo

On the other hand, my partner, a Type B, is supposedly known for his creativity, and Type Bs have “a strong sense of curiosity, but at the same time, loses interest easily.”

The personality traits of a Type B
Screen Capture taken from Tofugo

Because our blood type is inherited, defining our characteristics by our blood is akin to saying that these are traits that we are born with. If we were to follow that same train of thought, it probably also means that my husband and I are predetermined to be doomed from the start.

It would have been unnerving if there is some sort of scientific proof, but let’s be honest: Defining our personalities (or romantic compatibility) by blood is like buying a 4D iBet ticket—you whack all the combinations in the hope that at least one would be the winning number. 

Looking through the profile descriptions, my husband does not sound like a desirable person at at, what with ‘selfish’, ‘irresponsible’, ‘wild’, and ‘uncooperative’ as attributes. I’m no angel either, as a stubborn and wary perfectionist.

Clearly, we would have never been attracted to each other, much less survive the dating phase and gotten married if those traits were true to us, and if we had trusted the blood type compatibility reading.

The accuracy of it, or rather the lack of it, is unsurprising, considering that it’s been 90 years since the blood type personality theory gained traction and there still hasn’t been any credible sources backing it. Even studies that support the theory were said to be flawed. It’s worth noting that even the origins of it is quite sketchy, since it loosely based on a study Takeji Furukawa did with less than 20 people

Funnily, despite every site preempting me about its lack of scientific credibility, it goes on to share that blood type personalities is wildly popular in Japan and Korea. 

In fact, it has become such a culture norm in Japan that you can find blood type horoscope readings on their newspapers and local TV. Companies are known to hire based on blood types, and dating agencies cater to blood types. They even have blood type merchandise like sodas, chewing gum, and condoms.

Yes, because these condoms work the best if you get the right one for your blood (type)
Image Credit: Ex-pat No More

In Korea, there is even a romcom based off the romantic compatibility of different blood types. The 2005 comedy, My Boyfriend is Type B, “pursued the idea that a Type A woman and a Type B man are incompatible as a couple due to their blood-defined personalities.” 

After hours of research into this, the only substantial thing I got out is expert medical knowledge on the antigens and antibodies in different blood types, as well as something called the Rhesus factor. 

So What Am I?

In all seriousness, I believe our biological build does hold key to information about our body and us. 

For example, studies have shown that Type A produces the most amount of cortisol, a kind of stress hormones, which increases the chance of depression and fatigue. By that extension, we can loosely hypothesise that our blood types give us certain characteristics. 

Though I doubt that the blood type personality theory is are anything more than another profiling tool for us to quickly and easily categorise people into groups. It’s fun, and it should probably remain as just that. Otherwise, I’d need to really consider my marriage, and can you imagine how ridiculous that talk would be?

If you think about it, it would be mind-blowing if profiling tools like blood type personalities were to accurately and consistently illustrate everyone’s personality.

Moreover, there are so many other profile assessments out there. If I were to just put together my readings from some of the more popular profiling types and look at it as an entirety, I, as a Type A Gemini Goat Adventurer, will be pretty much the epitome of an identity crisis. So will be my Type B Gemini Rabbit Commander and our marriage.