Hi,
we've gotten this question quite a few times. When creating the game we wanted to make it clear that the list of terms we presented was in no way exhaustive. One way of doing that was to leave out some terms that would have been good fits and masc ended up being one of those left out.
However given the amount of people that have been looking for a masc room and were curious what it would look like, we would probably include it if we ever went back and added further rooms. Its absence is in no way ment as an invalidation of masc identities.