Um, all the things that are not bodily fluids. And anyway you picked one particular bodily fluid, not even essential to the functioning of a body.
Or put another way, that everything we know about supply/demand curves and evolution is wrong?
You can alter psychology of a person by altering brain structure, surely that link is well established even if the finer details aren't known?
You can run the same program on different hardware, and run the same program on the same hardware and get different results. I'm not sure the analogy gets us very far.
The argument was made that "bodily fluids" can't be a differentiator between men and women.