The virgin-mary tag is used for a lot of questions for which the perpetual virginity of Mary is not relevant. As most protestants reject the perpetual virginity of Mary this is problematic - it would be just as inappropriate as if, for example, the birth-of-jesus tag was named birth-of-jesus-the-eternal-son-of-god, which I'm sure many of our non-Trinitarian members would be deeply opposed to! We should try to keep all our tags neutral. Personally, our use of the virgin-mary tag feels like compelled speech, and it is close to offending me.
I'd like to propose that the tag be renamed to a more doctrinally neutral alternative, perhaps mary-mother-of-jesus, and that the perpetual-virginity tag be used for questions dealing with that doctrine.
It may also be good to reconsider whether mariology is worthy of being a separate tag. Any opinions on that?