"A few years ago, at a Japanese restaurant, I asked the sushi chef why I’d never seen a woman doing that job. He nodded solemnly and explained that, regrettably, it is impossible. Women cannot be sushi chefs because they have higher body temperatures than men, so when handling raw fish, women cook it a little. He was completely serious.
. . .
Now I know what you are thinking. You are still stuck on the first paragraph, wondering whether women really are warmer than men. It bothered me, too, so I did a little research.
It turns out that women’s core body temperature, on the average, actually is a fraction of a degree higher than men’s. But, interestingly, on the average, due to gender-related differences in peripheral circulation, women’s hands are a fraction of a degree colder than men’s.
I think I am going to go back to that sushi restaurant and ask my fish guy why, in light of this new data, men are permitted to be sushi chefs. "
https://www.washingtonpost.com/lifestyle/magazine/atgene-weingarten-gene-salutes-pretzel-logic/2013/11/08/e755c95a-4312-11e3-a624-41d661b0bb78_story.html