User blog comment:Omega natsu2/Chapter 364: Tartarus Arc, Part 1: Immorality and Sinners, Predictions./@comment-1839664-20131218032229/@comment-1359322-20131218161644

I won't steal it no reason to. I'm a DxD guy. :) That being said, that saying was actually taken from Japan, meaning "It is shame for a man not to eat a feast placed before him". In other words, any real Japanese man would never turn down a sexual offer from an attractive female — whether he’s married or not.