How do we know the mass of the earth?
I haven't really explored the concept of sapiosexuality, but I find Dr. Becky attractive and her obvious intelligence is a big factor. I always learn something from her videos, of course, but it's more complex than that.
I find any smart woman attractive. Size does not matter as it is just part of the package, you get what is there, both intellectually and physically. Someone who may appear as beautiful, but has no smarts I find not to be attractive.