Why is the girl's body warmer than the boy's?

In the first comprehensive experiments with a mercury thermometer in 1851, Carl Wunderlich demonstrated in studies of more than 25,000 individuals that the normal body temperature was around 37°C. He also noted that “grown up women may be a trifle warmer than men of an equal age”. read more

Wrong! When your body is used to being warm, colder air feels even cooler to the body. 2. Women on birth control have even higher core body temperatures. All of the above goes double if you're using hormonal birth control. Hormones affect your body temperature, though you may not notice it. read more

So there is literal truth in the old saying cold hands, warm heart. One theory as to why women have evolved this system, says Newton, is to enable them to survive freezing temperatures. Women carry less fat and muscle mass than men, and so need a more efficient technique of protecting their core body temperature. read more