A man's beard grows faster when he anticipates sex!
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So, this is one hair-growth strategy. In 1970, a paper by the title of “Effects of Sexual Activity on Beard Growth in Man.” Was published in Nature magazine. The author the paper placed himself on a deserted island. About every weekend however, he would get a visit from a female mate.
He began to notice a pattern; his beard grew at a relatively slow rate while he was alone, but when he was about to see the lady, there was a sudden increase in stubble. He attributed his growth to an increase in androgen (testosterone and other closely related hormones) levels that occur when preparing for sexual activity.
