What do women and computers have in common? You don't appreciate them until they go down on you.
How do you know if a blonde has been using your computer? When there's white-out all over the screen
They can both burn C.D's
Because it doesn't rain in the kitchen.
The phrase I went through a whole box of tissues watching that film. is a good place to start.
Answer in comments so you can fully appreciate the joke)
Because they don't appreciate random people knocking on their door.