Many guys have scant body hair due to genetic predisposition. Such as being of Native American ancestry (Hi there). And many other simply find the hair on places like their legs disappearing over time. All of this is normal.
If a man wants to shave his legs, or a woman doesn't want to - who is anyone to complain? And who invented the social expectation of a woman having shaved her armpits & legs? The razor manufacturers and the shaving soap companies! Look at pictures of women in the 1920's and 30's. They let it all hang out.
And it has been proven that humans, of both plumbing varieties, excrete pheromones that attract other humans, subconsciously, to mate. This 'scent' is mostly released through the hair follicles located in the armpits - in both sexes.
End Of Physiology/History Lesson.