Ibn Mas'ud said : When we were on an expedition along with God’s Messenger and had no women with us we asked whether we should not have ourselves castrated, but he forbade us to do that. Then he granted us licence to contract temporary marriages, and one would marry a woman giving a garment as dower up to a fixed date. Then ‘Abdallah recited, “You who believe, do not make unlawful the good things which God has made lawful for you” (Al-Qur’an 5:87). (Bukhari and Muslim.)