I had something to say about this. Being a virgin means not having sex, it has nothing to do with the hymen (the membrane). It breaking will not mean that you will lose your virginity, Virginity is far more valuable than that. You can break the hymen by inserting tampons, yes, you can also break it during vigorous excercise, and with your period, I mean, if there was a membrane, how will the fluid from the uterus's walls come out?