Musnad Ahmad 30:3725

Ali ibn Hafs narrated to us, Waraqa narrated to us, from Abu al-Zinad, from al-A'raj, from Abu Hurairah, who said: The Messenger of Allah, peace and blessings of Allah be upon him, said: "A woman will not remain straight for you upon one character. She is only like a rib; if you straighten it, you will break it, and if you leave it, you will enjoy her while there is crookedness in her."