The Messenger of Allah said: "No woman should look at the nakedness of another woman, and no man should look at the nakedness of another man."
Sunan Ibn Majah Book 1, Hadith 395
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Sunan Ibn Majah Book 1, Hadith 394 Next Hadith → 'Aishah said: "I never looked at (or I never saw) the private part of the Messenger of Allah." (Da'if)(One of the narrators) Abu Bakr (Ibn Abu Shaibah) said: "Abu Nu'aim would say: '(From) a freed female slave of 'Aishah.'"

Sunan Ibn Majah Book 1, Hadith 396