According to a recent study, it’s not the Tampax box sticking out of your purse that gives away your menstrual status — it’s your voice, says Huffington Post.

The psychologists behind the study, which was published in the December issue of the journalEthology, recorded 10 women counting to five at four different points throughout their menstrual cycles,Popular Science reported. The researchers then played these recordings for three groups of male participants in a random (more…)