Craving BDSM …the Ultimate Absolution?

Does the fact that someone is craving a BDSM lifestyle and finding themselves unfulfilled in a vanilla relationship inherently absolve them of infidelity? This concept bothered me since I read a story yesterday. For the record, I don't believe in trashing books just because they didn't sit well with me or I didn't like the story. This story was well written and engaging … I just have a philosophical issue with an aspect of it. I'm not going to mention the title, again because I don't believe ...