Sayyiduna Umar (may Allah be pleased with him) reports this saying of the Prophet (peace and blessings be upon him): "When a man is intimate with his wife and then wishes to do so again, he should wash his private parts."
Imam Abu Ya'la recorded it in al-Kabir. Its chain contains a narrator, Layth bin Abi Sulaym, who is mudallis (one who conceals defects in the chain).
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب النكاح / 7567