Sayyiduna Abu Umamah (may Allah be pleased with him) said: The Messenger of Allah (peace and blessings be upon him) was asked whether the people of Paradise will have marital relations. He said: "Yes, with a desire and an organ that will never tire nor come to an end, continuously, continuously."
Hadith Referenceالمعجم الكبير للطبراني / باب الصاد / 7643