Power difference definition: A difference that gives one party the edge over the other in a certain situation. So in case of a fight between men and women, the power difference is physical strength.

Double standards are created because there is an average power difference between men and women. Double standards, though seemingly 'unfair', usually have a reason for why they exists. They correct for differences between genders, which makes them generally tolerable but not always completely fair.

Too often they create unfairness where no significant power difference exists, in those cases they correct for a perceived difference thus creating a power difference by doing so. So there can also be a perceived power difference when there actually is no significant difference.

Power difference should therefore be logically determined on a case by case before judging whether a situation is fair.

Note: I posted this as a comment somewhere and get downvoted even though i am pretty confident that this makes sense, hopefully?