Following is an excerpt from a letter written by Srila Prabhupada to a devotee explaining how to deal with lust.
Regarding your enemy, Mr. Lust: I have noted the difficulties, but we should always remember that Krishna is stronger than any demon, and Mr. Lust, or his father or his grandfather, nobody can do anything provided we take shelter of Krishna very tightly. Now so far your personal matter is concerned, you are a Brahmacary, you can marry at any time, and in New York, all the nice girls, they are actually very suitable for our students, and I encourage that all the Brahmacaries may be very responsible, and marry one of the girls. Because generally the girls desire good husband and a good home, children, that is their natural propensity, so we want to show some ideal householders also. But the proposal that marriage will solve the question of lust, is not practical. Neither wife should be accepted as a machine for satisfying our lust. The marriage tie should be taken as very sacred. One who marries for subduing lust is mistaken. Because lust cannot be satisfied simply by indulging in sense gratification. It is compared with that extinguishing the fire with large amount of petrol. For the time being, the fire may appear to be extinguished by pouring a large quantity of petrol, but the petrol itself is so dangerous that at any time, it can be in flame. So to subdue lust is a different process. Then you have to take to Deity worship. I am sending herewith one copy of the process of Deity worship. Krishna is Madan Mohan. You have already stated in your letter, it is very nice, that you would much prefer to channel all your desires to Krishna, and you ask me how is this possible when enveloped in maya, seeing only material forms. You have also written to say that if you can see the Absolute Beauty which is all-attractive, then you could not help but be attracted and would scorn mundane beauty. This is actually the remedy. So you may take immediately to the Arcana, the Deity worship. Kirtanananda Maharaj has also begun Deity worship in New Vrindaban, and Pradyumna knows how he is doing, and similarly, in New York, Brahmananda is also engaged now in the Deity worship, and the process is a little difficult, in the beginning, but one habituated, it is not at all difficult. So apart from the marriage proposal, you may immediately take to Deity worship. I am sending herewith one copy of the process of Deity worship, and compiled by Brahmananda, that will help you and Pradyumna also knows, so combined together, you immediately begin Deity worship as Kirtanananda and Brahmananda is doing, and I am sure this process, helped by your regular chanting, will kill Mr. Lust, rest assured. Of course, when you begin, I am at your service always, and give you suggestions and ways and means to make progress in the Deity worship, but you can immediately adopt this principle.