It is narrated from Sayyiduna Jabir bin Abdullah Ansari, may Allah be pleased with him, that the Jews said to the Muslims that whoever has intercourse with his wife from behind, his child will be born cross-eyed. Therefore, Allah Almighty revealed this noble verse: «﴿نِسَاؤُكُمْ حَرْثٌ لَكُمْ فَأْتُوا حَرْثَكُمْ أَنَّى شِئْتُمْ﴾» [بقره: 223/2] "Your wives are your fields; go to your fields as you wish."