A fresh-faced lad on the eve of his wedding night goes to his mother
with the following question. 

"Mom, why are wedding dresses white?"

The mother looks at her son and replies,

"Son, this shows the town that yourbride is pure." 

The son thanks his mom and goes off to double-check this
with his father. 

"Dad why are wedding dresses white?"

The father looks at his son in surprise and says,

"Son, all household appliances come in
white."