[Solved] A man was working on a night shift when he suddenly received a telephone call giving him some information causing him to dash home at breakneck speed. On bursting into his bedroom quite breathless he found his informant was quite correct and his wife was in bed with someone he had never even clapped eyes on before. However, far from being angry he greeted them both with a friendly smile and a few hours later was bringing his wife breakfast in bed. What is the reason for this?