Yahya related to me from Malik from Humayd ibn Qays al-Makki thata man called Dhafif said that Ibn Abbas was asked about coitusinterruptus. He called a slave-girl of his and said, "Tell them." Shewas embarrassed. He said, "It is alright, and I do it myself."Malik said, "A man does not practise coitus interruptus with afree woman unless she gives her permission. There is no harm inpractising coitus interruptus with a slave-girl without herpermission. Someone who has someone else's slave-girl as a wife, doesnot practise coitus interruptus with her unless her people give himpermission."
USC-MSA web (English) reference: Book 29, Hadith 100
Arabic reference: Book 29, Hadith 1265