Does the cold weather in winter affect men's physiological reaction?

Yes, when the weather is cold, the male penis will obviously shorten and the testicles will retract. This is not the principle of "expansion with heat and contraction with cold".

Because the optimum temperature for male testis to produce sperm is about 65438 0℃ lower than the body temperature (37℃), when the outside temperature is high, the testis will descend to the bottom of the testis sac, and at the same time the testis sac will relax, which is beneficial to heat dissipation; When the weather is cold, the testicles will contract and return to the body, also to maintain a certain temperature. Similarly, in a weak state, the penis will be short when the external temperature is low and long when the temperature is high.