Sayyiduna Abu Ayyub (may Allah be pleased with him) narrated: It was asked from the Messenger of Allah (peace and blessings be upon him), "A man has intercourse with his wife but does not ejaculate?" So he said: "He should perform ablution like the ablution for prayer and wash his private part."
Hadith Referenceمسند عمر بن عبد العزيز / عمر بن عبد العزيز عن عروة بن الزبير / 58
Hadith Takhrij«صحيح بخاري ، الغسل ، باب غسل ما يصيب من رطوبة فرج المرأة 292 ، مسلم ، الحيض ، باب بيان ان الجماع كان فى اول الاسلام ... الخ 347»