Washing Machine Code

So there's a Mr n Mrs who use 'washing machine' as a code for sex. One night Mr snuggles up and says 'Washing machine?'. The Mrs grunts and rolls over. Some time later the Mrs thinks 'Hmmmm go on then' so rolls back and whispers into her hubby's ear 'Washing machine' at which time hubby says 'Nah it was only a small load so I did it by hand'.