It was narrated that `Ali (رضي الله عنه) said:
A Bedouin came to the Prophet (ﷺ) and said: O Messenger of Allah, what if we are in the desert and a little wind comes out of one of us? The Messenger of Allah (ﷺ) said: “Allah, may He be glorified and exalted, not too shy to tell the truth. If one of you does that, let him do wudoo`. And do not approach women in their back passage [and once he said: in their anuses].`