Ever Wondered What's The Reason Why We Have Butt Hair? - Ever heard of the Pilonidal disease?

Ever heard of the Pilonidal disease?

This is another bothering occurrence of hair grown in the butt. Complication happens somewhere in the butt crack region, due to "hairs embedding the skin," and this happens more in men.

Moving on, as humans are lacking in knowledge as of the moment.

The best thing that could be done is to theorise its origin.