"If anyone thinks he is acting improperly toward the virgin he is engaged to, and if she is getting along in years and if he feels he ought to marry, he should do as he wants. He is not sinning. They should get married. But the man who has settled the matter in his own mind, who is under no compulsion but has control over his own will, and who has made up his mind not to marry the virgin - this man also does the right thing. So then, he who marries the virgin does right, but he who does not marry her does even better." NIV translation
If God has called you to remain single in serving Him, then He takes away the physical desire to be with a woman intimately. If God does not call you to do so, then He will bring to you the woman that He has created for you just as He did with Adam and Eve in the garden. Either way, it is good to listen to the Lord and to remain in His calling for your life. Problems arise and Satan uses it when we try to operate outside of the power and calling that God has placed on our lives.
"So then, he who marries the virgin does right, but he who does not marry her does even better." NIV translation
Paul reminds us that it is better to remain single and focused on the things of God. But, it is also good to obey God and marry if He has not given you the ability to resist the temptation.
"A woman is bound to her husband as long as he lives. But if her husband dies, she is free to marry anyone she wishes, but he must belong to the Lord. In my judgment, she is happier if she stays as she is - and I think that I too have the Spirit of God." NIV translation
Paul explains the freedom that is in Christ concerning marriage and then gives us his opinion regarding a widow. We notice that he is not laying down hard and fast rules and condemning those who remarry. Instead, he is giving his opinion ("In my judgment") based on the experience he had of losing his wife.