Ok, i will try.
The concept of married by now is pretty different as what was told around the last century. There is different countries where you can marry not just a person with another gender, but with some like:
A dog, a pillow, great differences in age, the dead, a picture, and go the way you want to dress.
Not just dogs, but goats and dolphins too
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There is even more crazy marriages as the guy that marry Nintendo DS's Love Plus game
The lady married to the Eiffel Tower, how to forget about that!!??
Even Rollercoasters and holograms are husbands and waifus in THIS WORLD.
But, there is a pattern in all this ceremonies, which is clear as water, it is that a physical entity must be there to be a couple.
If you
@Undina notice this, you may logically think that science and any other concept "can't" be used to marry someone, because of the actual imposibilities of our societies around the globe.
I only will suggest you to simply accept this trait of Senku as for a greater good, even when things like cooking, sex, and economics can be -with a wide point of view- come from the reasons that allowed humans to develop science as how it is now in 2020.