Reference for Ketubot 150:1

אבל במומין שבגלוי אינו יכול לטעון ואם יש מרחץ באותה העיר אף מומין שבסתר אינו יכול לטעון מפני שהוא בודקה בקרובותיו:

but with regard to defects that are exposed he cannot make any claim. b) And if there was a bath-house in the town he cannot make any claim even about concealed defects, because he [is assumed to have had her] examined by his female relatives.

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