1- Islam encourages marriage to prevent committing adultery, and considers marriage to be one of the ways of the Messengers;The Messenger of Allah (peace and blessings of Allah be upon him) said: “O young people, whoever among you can afford to get married, let him do so, for it helps one to lower the gaze and protect the private parts (i.e., remain chaste). Whoever cannot afford it, let him fast, for it is a protection for him.” 2- If a man wants to get married but is unable to spend on a wife, then he should adhere to the words of Allah.24:33 “And let those who find not the financial means for marriage keep themselves chaste, until Allâh enriches them of His Bounty”  
3- Islam urges people to get married, and prohibits celibacy and castration. It is forbidden to forego getting married even if the intention is to devote oneself to worship. “There is no monasticism in Islam.” because they are against his nature, and against having children. 

4- Islam forbids adultery for the sake of reserving lineages, and to prevent unlawful pregnancies and social problems.17: 32. And come not near to the unlawful sexual intercourse. Verily, it is a Fâhishah [i.e. anything that transgresses its limits (a great sin)], and an evil way (that leads one to Hell unless Allâh forgives him). 

 5- Islam forbids accusing others of adultery and considers it a great sin. 24: 15. When you were propagating it with your tongues, and uttering with your mouths that whereof you had no knowledge, you counted it a little thing, while with Allâh it was very great. 

 6- Islam prohibits a man to be alone with a woman who is not a relative he can’t marry, because that causes temptation to do immoral and evil actions. The Prophet (peace and blessings of Allah be upon him) said: “No man is alone with a (non-mahram) woman but the Satan is the third one present.” 

7- Islam forbids unlawful sexual relationships and marrying a woman not chaste.5: 5. Made lawful to you this day are AtTayyibât [all kinds of Halâl (lawful) foods, which Allâh has made lawful (meat of slaughtered eatable animals, etc., milk products, fats, vegetables and fruits, etc.). The food (slaughtered cattle, eatable animals, etc.) of the people of the Scripture (Jews and Christians) is lawful to you and yours is lawful to them. (Lawful to you in marriage) are chaste women from the believers and chaste women from those who were given the Scripture (Jews and Christians) before your time.