Musannaf Ibn Abi Shayba 1:963

Ghundar narrated to us, from Shu'bah, from Mansur, who said: I heard Hilal narrating from al-Murraqa' from an Umm Walad (a slave woman who bore a child for her master) of Sa'd ibn Abi Waqqas, that Sa'd used to come to her, and if he did not ejaculate, he would not perform ghusl (ritual bath).