Why are men hairy?

Answer 1

Mainly because of Testosterone. If men start taking progesterone, (as in female re-assignment programs), then the hair stops forming on the legs and arms.

testosreronone yes, but the real reason is to block the pores from infection or parasites in vital areas...armpits, chest, head etc

Answer 2

All mammals have hair, even mammals that "appear" bald (e.g. whales, pigs, etc.). Among primates, humans have the least amount of body hair/fur. Evolutionarily speaking, it is not entirely clear why men tend to have more body hair (and facial hair) than do women. However, there are probably a couple of things going on:

1. Sexual selection. At various times in human history, hairier men may have been chosen as sexual partners/mates more than smoother men because for whatever reason this was more appealing to women. This probably explains at least facial hair, which is not unlike manes seen in other mammals such as lions, etc. Body hair correlates in part to testosterone, so sexual selection may have preferred body hair for this reason as well.

2. Protection. Men with hairy chests, shoulders, or backs have natural protection against mosquitoes and insects, and human populations in insect-prone areas do tend to be hairier. This protection also means protection from diseases spread by insects. Body hair can also regulate body temperature a bit, keeping someone warmer or cooler depending on the context.

3. Genes/hormones. Male body hair varies dramatically from one man to the next: this is determined in part simply by genetics and hormones in an individual.

There is one kind of "out-there" hypothesis called the Aquatic Ape hypothesis that holds that humans lost most of their mammalian hair during a phase when prehumans were living in a semiaquatic environment, perhaps along lakeshores or seashores. By this theory, women ended up with less hair because they spent more time in the water, whereas may spent more time on shore. Again, this is not a mainstream hypothesis, but it's one idea of many.

Answer 3

One reason why men may have hair on their chests is because it increases their reproductive capacity.

It is interesting to note that the corresponding region on the female body, the mammary gland and nipples are highly erogenous zones whereas in males the nipple seems to be much less sensitive. I postulate that the reason men have hairy chests is that, merely by being in close contact with a woman, through hugging, especially at night, that the chest hair may stimulate arousal in the woman without any active participation of the male, who may very well be asleep with his partner lying on his chest. A woman who is aroused more easily by a particular male is more likely to produce his (in this case hairy chested) offspring.

Answer 4

Men tend to have more body hair than women due to higher levels of testosterone, which stimulates hair growth. This is a natural evolutionary trait that was once important for warmth, protection, and pheromone dissemination.

Answer 5

men are able to grow beards due to a hormone released at the base of the man's penis. this hormone stimulates hair follicles in the facial area and enables a beard to grow.

Answer 6

men get so hairy because hair sokes up sweat and keeps you from getting infections easaly