Premarital sex is prohibited by Jewish law. This, and a perfectly normal sex drive, is often incentive enough for young religious Jewish couples to get married ASAP.
You've been served! Divorce in the religious Jewish community requires a get, the Hebrew term for divorce papers. The man has more control over the decision than his wife. If a man refuses to grant his wife a divorce, she assumes the status of an agunah (literally, "chained" or "anchored" wife); she is unable to remarry religiously until the divorce is granted.