Reason Necessitating Ghusl (bath) for Men and Women

2. A number of our people have narrated from Ahmad ibn Muhammad ibn ‘Isa from Muhammad ibn ’Isma‘il who has said the following: “I once asked al-Rida عليه السلام, about a man who performs sexual relation with woman near her vagina but does not discharge, if Ghusl (bath) becomes necessary. He (the Imam) said, ‘When private parts touch each other Ghusl (bath) becomes necessary.’ I (the narrator) then asked, ‘Is touching of private parts disappearance of glans penis?’ He (the Imam) replied, ‘Yes, it is such.’”