Except in the homosexual hive mind, there’s no concept of marital (or even “partner”) faithfulness, not in any sane sense of the word. Monogamy is the exception, not the rule.
Maybe I'm splitting hairs. But - for instance - me thinking "Hey, that new girl in HR is cute", is completely different from regularly getting a hotel room with her on Tuesdays after work.
Especially if you asked Mrs WBill, lol.
However, I think that the homosexual lobby doesn't make (doesn't WANT to make?) that jump in logic. It's more convenient for them to equate the thought with the action.