That is strange. My husband uses the NASB and found verses in Romans that certainly convicted him as to what our feelings about h*m*s*xuality should be.
Romans 1:32 and although they know the ordinance of God, that those who practice such things are worthy of death, they not only do the same, but also give hearty approval to those who practice them.
The problem with such translations is not that they are incapable of convicting believers of sin, but that "untaught and unstable people twist to their own destruction, as they do also the rest of the Scriptures." 2 Peter 3:16 They do so quite convincingly to the detriment of the church by posting their own eisegesis in the form of scripture passages isolated and woven into their own commentary online, or in books. The older versions have wording that are more difficult to twist. Also, as I mentioned before, I have heard that newer versions omit any reference to blood atonement. Finally, some versions have entire verses removed, and put them in as a footnote as if they are not as important as other scripture, calling into question if all scripture should be though of as equal. It is scary to think of a new believer reading through such Bible versions in some cases, or meeting Mormons or Muslims who have been trained to use the NIV to deconvert people. To be fair I haven't researched the NASB myself much, but it is worth researching your version to see what people say about why it might be of concern.