Ibn `Abbas recited. "No doubt! They fold up their breasts." I said, "O Abu `Abbas! What is meant by
"They fold up their breasts?" He said, "A man used to feel shy on having sexual relation with his wife
or on answering the call of nature (in an open space) so this Verse was revealed:-- "No doubt! They
fold up their breasts."
Sahih al-Bukhari Book 65, Hadith 204