Musannaf Ibn Abi Shayba 9:1595

Abu Bakr narrated to us, he said: Sufyan ibn 'Uyaynah narrated to us, from 'Ammar, from Abu Muslim, from Abu 'Imran, from Abu Yahya, who said: I saw a man ask Ibn 'Abbas, and he said: "O Ibn 'Abbas, I am a man who plays with my private part until I ejaculate." He said: Ibn 'Abbas said: "Ugh, ugh. It is better than adultery, and marrying slave women is better than it."