1. Al-Husayn from Muhammad has narrated from Mu’alla ibn Muhammad from al-Husayn ibn Ali from Aban from certain persons of his people who said: “This is concerning my question before abu ‘Abdillah (a.s.), about penetrating women in their rear. He (the Imam) said, ‘She is a [means of] pleasure for you, so don't abuse her.’”

Translation: Muhammad Sarwar·Thaqalayn link·The Arabic above is the original.

2. Muhammad ibn Yahya has narrated from Ahmad ibn Muhammad from Ali ibn al-Hakam from who has said, ‘I heard Safwan ibn Yahya who has said the following: “I once said to al-Rida’ (a.s.), that one of his followers has asked me to ask you a question in which he feels shy and intimidated. He (the Imam) asked, ‘What is the question?’ I asked, ‘Can a man come to his wife in her anus?’ He (the Imam) said, ‘It is up to him.’ I then asked, ‘Do you do so?’ He (the Imam) said, ‘No, we do not do so.’”

Translation: Muhammad Sarwar·Thaqalayn link·The Arabic above is the original.