In the 8th grade, my math teacher was a VERY pretty and curvaceous redhead. All the guys had a habit of checking out the "scenery" whenever she would bend over a student's desk and it got so we would ask for help much much more frequently than would be expected based on the material.
One day she caught on and fled from the room in tears, never to be seen again by any of us.
Her replacement was an older lady who dressed like a Salvation Army officer, and much less attractive.
True story.