Husband and Wife agreed that whenever they want to have SEX, they will call it 'PHONE CALL' so that the children won't understand.
One day, Dad sends Son to tell Mum that he wants to make a 'PHONE CALL'. Mum replies: tel your Dad that the Network is busy today.
Dad replies: tell your Mum that d call is urgent, if Network is busy, then am going to a PUBLIC PHONE BOOTH.
Mum replies: tell him that if he dare goes to Public Phone Booth, I will OPEN a Business Center and all 'PHONE CALLS' will be FREE
#upvote after laughing