"We were lusting after women & chastity had become too hard for us, but we wanted to get the ransom money for our prisoners. So we wanted to use the 'Azl' (Coitus Interruptus- where the man withdraws before ejaculating)...We asked the Prophet about it & he said: "You are not under any obligation to stop yourselves from doing it like that.." Later on the women & children were given for ransom to their envoys.