What is attractive is always the same. The golden ratio to be found in the face of the sphinx. Sacred geometry.
Ofc when there was a famine for a long time then fat people become sexually attractive. Not just in Korea but in Europe as well, look up the famous artist Rubens.
A big butt big breastfed long legged woman is sexy because those are signs of fertility and health. Same with men who look physically capable.
The reason why someone can be attracted to my little pony for example is because of geometry and conditioning. Look up the old Lola Bunny design for example and then the new one. One is sexy the other is not. If you grow up as a child and you have all these animal comics and movies then the threshold lowers and you stop seeing them as animals and start to see them as equal.
Also a big part in attractiveness is emotion. A dog looking at you with sad eyes can make you feel sorry for example.