It's funny - in HS we had a uber hot teacher, Mrs. Van Horn. There were rumors running through the school that she was cheating on her husband with a student (his name was Robert something). Of course everyone thought that there was NO WAY this lankey and pimply HS senior was hitting it with this very hot teacher. I moved to Maine my junior year. The rumors started when this kid in question was a sophomore and continued right up until he graduated.
Wouldn't you know it? Within a year of our graduation she was divorced and re-married...to the student we all heard rumors about!
I believe that they are still married to this day.
My best friend shacked up with one of my "hot" ex teachers a couple of years after High School ... shortly after her divorce. She was about 28 and he was about 20 at the time. It lasted a couple of years but neither expected it to last. They are still good friends.