If men and women are in a boyfriend-girlfriend relationship and are committed to each other and are seeking to get married down the lane, then why does Islam forbid such a relationship? What is the harm in such a relationship?
If both are devoted and are seeking marriage why not be able to have sex?
I'd like the translated excerpts from the holy book that specifically states that such a relationship is haram and that any contact including intercourse while in such a relationship is haram as well.