Hey just FYI, whenever you submit something into the fetish category, DA automatically marks it as mature. It doesn't matter if it contains nudity or not. I've had this issue with my work as well when I put it into this category. Unfortunately it's the downside to submitting to the fetish category. So don't worry, it's not that somebody intentionally marked it. It's automatic in DA's system.
About the "mature content" thing: It's hopeless, they shield themselves behind their policy, but you see things much more sexualy explicit than a woman smoking (1st time I hear that that is a sexually explicit thing) that are not labeled as "mature content" So you don't know what rules to follow, because they don't apply the rules with the same severity to everyone. All in all, is the stupid, narrow-minded people at work, yet again