Sahih Muslim 3537
صحيح مسلم#3537SahihThis hadith has been reported on the authority of Jabir through another chain of transmitters, but in the hadith transmitted on the authority of Zuhri there is an addition (of these words):" If he likes he may (have intercourse) being on the back or in front of her, but it should be through one opening (vagina)
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Every narration in Sahih Muslim is accepted as Sahih (authentic) by the established status of the book.
In-book reference: 16:139