Islam strictly forbids pre-marital sex between a man and a woman. Allah (SWT) says in the holy Quran:
21 O ye who believe! follow not Satan's footsteps: if any will follow the footsteps of Satan, he will (but) command what is shameful and wrong: and were it not for the grace and mercy of Allah on you, not one of you would ever have been pure: but Allah doth purify whom He pleases: and Allah is One Who hears and knows (all things).
Surah noor chaptor no 24 verse no 21
68 They said: "Beseech on our behalf Thy Lord to make plain to us what (heifer) it is!" He said; "He says: The heifer should be neither too old nor too young, but of middling age. Now do what ye are commanded!"
Surah bakarah verse no 68
surah al muminoon chaptor no 23 verse no 5
Say to the believing men that they should lower their gaze and guard their modesty: that will make for greater purity for them: And Allah is well acquainted with all that they do.
surah noor chaptor no 24 verse no 30
32Nor come nigh to adultery: for it is a shameful (deed) and an evil, opening the road (to other evils).
surah al isra chaptor no 17 verse no 32