Naughty GPKers and Friends

A fireman came home from work one day and told his wife,
'You know, we have a wonderful system at the fire station:
BELL 1 rings and we all put on our jackets,
BELL 2 rings and we all slide down the pole,
BELL 3 rings and we're on the fire truck ready to go.
'From now on when I say BELL 1 I want you to strip naked. When I say BELL 2 I want you to jump in bed. And when I say BELL 3 we are going to make love all night.'
The next night he came home from work and yelled
'BELL 1!'
She promptly took off all her clothes.
When he yelled 'BELL 2!'
She wife jumped into bed.
When he yelled
'BELL 3!'
They began making love.
After a few minutes she yelled, 'BELL 4!'
What is BELL 4?' asked the husband?
'ROLL OUT MORE HOSE,' she replied. 'YOU'RE NOWHERE NEAR THE FIRE.'

Thanks SP!