Musannaf Ibn Abi Shayba 1:962

Ghundar narrated to us, from Shu'bah, from Mansur, from Hilal ibn Yasaf, from Kharashah ibn al-Habib, from Ali: That he said regarding the ghusl (ritual bath) for sexual intercourse: If he does not ejaculate, then he does not have to perform ghusl. It was said: Even if he thrusts with it until her labia (or her earrings) shake?