Considering that the points addressed thus far have a lingering impact on your original question...
"Do Japanese guys pay for meals/outings for female friends?'
I would say not so much. In fact I would even go as far to say that there is a certain level of bias perception in your original question seeing as it was aimed at Japanese men originally, that the developments of the discussions so far; have removed for the sake of legitimacy and reason.
Where the original question was "Do Japanese guys..." and it has now conversed itself into " Should men pay for meals, What are the implications of, etc etc..."
Objectively speaking, to ask the question with an added prefix of Japanese Men within a question imposes an underlining imposition that other men in fact do and that the original assumption is that Japanese men don't, because otherwise asking the question would be a moot point. But that is primarily due to the structure of the question, of where it was presented and in the fashion it remains presented.
But I'm sure that wasn't the intention.
Because we all say what we mean but don't mean what we say.
