Abd al-Malik narrates from Sayyiduna Jabir bin Samurah (may Allah be pleased with him) that a man asked the Prophet (peace and blessings be upon him): "O Messenger of Allah, may I pray in the garment in which I have intercourse with my wife?" He said: "Yes, unless you see some trace on it, in which case wash it."
Hadith Referenceالمعجم الكبير للطبراني / باب الجيم / 1868