From him, from some of the Kufans, raising it to Abu Abdillah عليه السلام, peace be upon him:
(Imam عليه السلام was asked) regarding ‘a man who (intimately) comes to a woman in her anus while she is fasting.’ Imam عليه السلام said: “It does not invalidate her fast, and there is no ritual bath (ghusl) upon her.”
Ali Akbar al-Ghaffari
Tahdhīb al-Aḥkām fī Sharḥ al-Muqniʿah, vol. 4, p. 399