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I think that in some cases, ending a question in の is fine for male speakers. For example, I hear え～、そうなの？ quite often from male speakers. I think, in general, we have that (all male speech) rhetorical questions are allowed to end in の, e.g. even if it is clear what the other person is doing, you may ask 何をしてるの？ or 何してんの？ What (the heck) are ...