Sa'd b. Abu Waqqas (Allaah be pleased with him) reported that a person came to Allaah's Messenger (sallAllaahu alayhi wa sallam) and said: I do 'azi with my wife. Thereupon Allaah's Messenger (sallAllaahu alayhi wa sallam) said: Why do you do that? The person said: I fear harm to her child or her children. Thereupon Allaah's Messenger (way sallAllaahu alayhi wa sallam) said: If that were harmful it would harm the Persians and the Greeks.