The Prophet (ﷺ) said: He who has intercourse with his wife through her anus is accursed.
Sunan Abi Dawud Book 12, Hadith 117
← Previous Hadith Ibn ‘Abbas reported the Prophet (ﷺ) as saying “If anyone who means to have intercourse with his wife says “In the name of Allaah, O Allaah, keep us away from the devil and keep the devil away from what You hast provided us.” It will be ordained that no devil will ever harm the child born to them.

Sunan Abi Dawud Book 12, Hadith 116 Next Hadith → Muhammad bin Al Munkadir said I heard Jabir say The Jews used to say “When a man has intercourse with his wife through the vagina, but being on her back the child will have a squint, so the verse came down. Your wives are a tilth to you, so come to your tilth however you will.”

Sunan Abi Dawud Book 12, Hadith 118