Sayyiduna Abu Sa'id al-Khudri (may Allah be pleased with him) narrates that the Prophet (peace and blessings be upon him) said: "When the people of Paradise have relations with their wives, those women will become virgins again."
Imam al-Bazzar and Imam al-Tabarani (in al-Mu'jam al-Saghir) recorded it; its chain contains a narrator, Mu'alla bin Abd al-Rahman al-Wasiti, who is kadhdhab (a liar).
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب أهل الجنة / 18753