You seem to refer that text to the same-sex couple down the street who chose a monogamous relationship by marrying one another. Ludicrous!
By the way, since you come across as knowing, what is the difference between being attracted to someone sexually and 'lusting'? I'm still waiting for some meaningful answer to that question. Also, since you want to put it into perspective, what is 'shameful' lust as opposed to 'regular' lust ...? 
The Greek word ἀτιμίας, here translated "shameful" consists of the word τιμὴ, "honored" and the prefix ἀ-, "not," and means dishonored. It does not, however mean dishonorable. It is dishonored in the sense of being undervalued, not in the sense of being despised, although undervalued things often become despised.
Later in the same letter, Paul speaks of God as a potter who makes two pots from the same lump of clay. One is τιμὴ made for an honored purpose, the other is ἀτιμίας, made for a dishonored purpose. Still, it was made for a purpose, and its fulfillment is found in achieving that purpose. And there is no shame in fulfilling a dishonored purpose, since the fault, if one thinks in those terms, is not in the clay, which is the same clay used for the honored pot, nor in the pot which had no say in how the potter formed it. no shame at all as long it is fulfilling its purpose.
The picture Paul presents is that of the good china and the everyday dishes. But it is just as valid, and probably a better lesson if the second pot is not the second-best, but the poorest. Even if it is a chamberpot, the second dish is still fulfilling its purpose as ordained by the Potter.
The Greek word πάθὸς, here translated "lust" means emotions. The Greek philosophers, from whom Paul borrowed this example, saw Reason as the paramount virtue. And the way to achieve Reason was to subordinate all emotion to the intellect. This what they considered to be "natural," or in accordance with man's higher (
Reasonable) nature.
All actions either had a rational basis, or they were "unnatural," a concept similar in effect to the Jewish concept of sin. In effect, but not necessarily in essence.
So the "shameful lusts" or "dishonored emotions" that are referred to, are those that Greek philosophers disapproved of. And they disapproved of them because they do not help a person develop Reason.
But if their purpose was never to help a person develop Reason, but something else altogether, something that they do achieve, then those that experience them are not vile, they simply have a different purpose to fulfill.
