Relationship before or without marriage is not accepted by God. Jesus told us that if a man / woman looks anyone lustfully, he or she has already committed adultery in heart (Matthew 5:28). So loosing virginity physically or mentally is a Sin. Above all don't cheat your future life partner because Virginity is the Originity of Marriage. May God Bless Your Married Life in the Victorious name of Jesus! Amen!