You are reading a tafsir for the group of verses 55:56 to 55:59
فيهن قاصرات الطرف لم يطمثهن انس قبلهم ولا جان ٥٦ فباي الاء ربكما تكذبان ٥٧ كانهن الياقوت والمرجان ٥٨ فباي الاء ربكما تكذبان ٥٩
فِيهِنَّ قَـٰصِرَٰتُ ٱلطَّرْفِ لَمْ يَطْمِثْهُنَّ إِنسٌۭ قَبْلَهُمْ وَلَا جَآنٌّۭ ٥٦ فَبِأَىِّ ءَالَآءِ رَبِّكُمَا تُكَذِّبَانِ ٥٧ كَأَنَّهُنَّ ٱلْيَاقُوتُ وَٱلْمَرْجَانُ ٥٨ فَبِأَىِّ ءَالَآءِ رَبِّكُمَا تُكَذِّبَانِ ٥٩
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3

لَمْ يَطْمِثْهُنَّ إِنسٌ قَبْلَهُمْ وَلَا جَانٌّ (...whom neither a man will have touched before them, nor a Jinn....55:56). The word طْمِث tamth has different meanings. 'Menstrual discharge' is termed as tamth, and the menstruating woman as طْامِث 'tamith'. It also means 'sexual intercourse with a virgin'. This second sense is meant here in this verse.