The cause of male pattern baldness is no longer a mystery. Research has shown that when the male hormone - testosterone is exposed to 5-alpha-reductase, an enzyme in the hair follicle, it produces another hormone called dihydrotestosterone (DHT), which causes permanent hair loss. This hormone (DHT) causes the hair follicle to shrink and grow a finer hair that is lighter in color, shorter and less deeply rooted than its predecessor. Most often, the hair in the balding region will continue to grow at an increasingly slower rate until hair growth ceases completely. The pattern of progression, and the extent and speed of male pattern baldness, is largely dictated by genetics, hormones and age.



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Good question but I've no answer to explain in details but It's odd, too, that hairless men are believed to be more virile, but this is only because hairless men are more furry chested, and furry systems provide the impact of additional maleness.