In a long term survey, men who need to shave less often (rather than, like me, simply don’t bother) were at a greater risk of strokes. The growth of body hair is an indication of hormone levels, and it’s possible these may be linked to the health risk.
The link between shaving and sex was established in 1970 by a man living on a remote island who noticed that each time he went to the mainland, where he had sex, his beard grew more quickly.