Aside from the obvious differences in your experiences with your siblings, birth order might affect personality, IQ, and even your sex life.
It only makes sense that it might determine what kind of person meshes well with your unique personality.
My older brother was born to parents who had relatively minimal experience with babies, had never used the Internet, and who had only been married for two years before he was born.
Seven years later, my littlest sister was born to parents who had the confidence of rearing three other kids under their belts, already knew all the words to Barney, and were relatively unfazed by her shenanigans.
Female firstborns in particular are found to be statistically more likely to be the most qualified in their families, and the most ambitious about their careers.
Even if there isn't a scientific element to how birth order might affect your personality and preferences, there is an undeniable experiential element to it.
Think about it — the parents one child is born to are certainly not the same parents another kid is born into.
(Just kidding, she was adorable and there was no way to be unfazed by the shenanigans.
What if our ~one true love~ isn't determined by fate or science or some grand design?
What if something as simple as birth order determines what kind of person you date?