That's really interesting, curious to research as well. Know that colder weather tends to make men shrink to preserve ******* flow so there must be so much to information available on this matter.There actually is evidence. Colder climates lead to bigger girths. Warmer climates lead to lengthier shafts. African American men have long shafts but because are adapting to American climates (depending how far north you are), they are getting thicker as well. African American men have large girth and length
Have had friends of mine who are black say they hate cold weather for other reasons but a lot of what you expanded on makes a lot of sense.