Sayyiduna Jabir bin Abdullah (may Allah be pleased with him) narrates: The Jews used to say: Whoever approaches his wife from behind to her front private part, a cross-eyed child is born to him. So Allah Almighty revealed this verse: «نِسَاؤُكُمْ حَرْثٌ لَكُمْ فَأْتُوا حَرْثَكُمْ أَنَّى شِئْتُمْ» (2-al-Baqarah:223) "Your wives are your fields; so come to your fields as you wish."