2. Muhammad ibn Yahya has narrated from Ahmad ibn Muhammad from Muhammad ibn ‘Isma’il who has said the following: “I once asked al-Rida’ , about the case of a man who had a slave-girl and he kissed her; if she was lawful for his sons. He (the Imam) asked, ‘Was it with lust?’ I replied, ‘Yes, it was with lust.’ He (the Imam) said, ‘He then has left nothing if he has kissed with lust.’ He (the Imam) then initiating said, ‘If he makes her bare and looks at her with lust she becomes unlawful to marry for his father and his son.’ I then asked, ‘What happens if he looks at her body?’ He (the Imam) said, ‘If he looks at her vagina and body with lust she becomes unlawful for him.’”