I've heard this song my whole life and liked the sound, never really listening to the meaning of the lyrics. I'm sure we all do that. But when I did really pay attention, the meaning was no mystery. Then after reading Gordon's description and knowing the song is about infidelity, the chorus variations seem pretty evident. "Sometimes I think it's a sin when I feel like I'm winning when I'm losing again". --To cheat on someone might feel great at the moment. It might feel like a win, but you know inside that you are losing a part of yourself and that it's a sin. "Sometimes I think it's a shame when I get feeling better when I'm feeling no pain". --Again, infidelity might make your feel great physically, but you weren't feeling bad to begin and inside one would feel shame in that (or we'd hope they would). I have a different take on the "Sundown" portion. "Sundown, you better beware if I find you've been creeping 'round my back stairs." --To me, this seems like he knows that while he's away, his lover is also cheating on him. At the end of the day when you come home, at sundown, if you find out someone has been sneaking around your house, that person had better beware. They're living dangerously and you might just hurt them. That's what jumps out at me immediately. I could be wrong, but sometimes you hear the lyrics of a song and something jumps out at you. Once it does, it's hard to shake it or see it in another way. Either way, I've always loved the mellow sound of the song and remember it from my early childhood. Despite the dark lyrics, I'll always enjoy hearing it and punish those around me by singing along out loud.