[throwaway657656]

Farenheit set 100F to be his wife's internal temperature. 0F was the freezing point of brine and humans are mostly brine. F is human centric.[0]

[0] https://en.wikipedia.org/wiki/Fahrenheit

[technothrasher]

He says in his original paper that the top point of his reference scale is 96, not 100 for the point where "Alcohol expands up to this point when it is held in the mouth or under the armpit of a living man in good health". He originally based his scale on 12, and then got more precise by increasing each division by two several times, ending up with 96.

[tremon]

So basically, Fahrenheit chose 100°F to be the temperate when he gets hard and 0°F to be the temperature when his wife gets hard?