Sahih Muslim Book 008, Hadith Number 3233.

Chapter: One who can support a wife should marry.

Abdullah (b. Mas’ud) (Allah be pleased with him) reported that Allah's Messenger (May peace be upon him) said to us: O young men, those among you who can support a wife should marry, for it restrains eyes (from casting evil glances) and preserves one from immorality; but he who cannot afford It should observe fast for it is a means of controlling the sexual desire.