Rav Nahman made a very big deal about sexual purity, and I can see that he was right on one hand. But there is also the danger of adding and or subtracting from what the Torah commands, -as its says in Devarim Deuteronomy,  not to add or subtract from the law. after all in Torah there are things that are emphasizing and things which are less emphasized-- and it is not up to every individual to decide on his or her own what is really important and what is not.

For a simple and well know example: lashon hara [slander]. וויתר הקדוש ברוך הוא על עבודה זרה  גילוי עריות שפיכות דמים ולא וויתר על לשון הרע  God let go and forgave sexual sin, murder and idolatry in the time of the first temple but did not forgive them for lashon hara.

Even though there are specific conditions in which one can speak negatively about others as a rule anything one says about others that is negative comes under the category of lason hara.

So we see that there is a hierarchy of values in Torah and it is not just up to everyone to decide for themselves what is more important and what is less. 

For this reason it is worthwhile to learn the Gates of Repentance which gives a basic overview of the commandments and their degrees of being more or less important