I have a question that has awoken me from my lurking slumber...
Is Junko romance required to get the revolution flag? If so that's pretty specific.
I'm pretty sure all it takes for "fakerevolutionunlock" is to have >=5 evil points.
As for the revolution flag - yes, you should have a romance with Junko. The point is that your DomKane should be very good in terms of moral compass and decisions he makes, a kind of "white knight" and the relationship with Junko is a kind of litmus test that will show the influential people in the "revolutionary faction" that you are pure of heart and willing to follow the path and join them (and that you can be trusted).
Later, when you meet Dominique, if you choose her over Junko, you can get a romance dominiqueromanceopen flag and
junkocheat flag, thus opening a "good romance" with Dominique, but it won't get you off the revolutionary path, so you don't have to be celibate for the whole game and be faithful to Junko only.
As for the flag fakerevolutionunlock - this is an evil version of the revolution flag, as the name implies, you will be on the path that should prevent the revolutionaries from achieving their goals.