my question is this how an unmarried girl can know that she has no hymen as u have said in one of a girl reply that some girls dont have hymen since birth  so how can a girl knows that she has no hymen ...and without sexual intercourse is there any source that effect hymen?....and when u feel erected and the secretion comes out from vagina is that effect hymen? does hard exercise effect it? and if you masterbate without inserting anything or even finger,only with the water does it effect hymen? and where the exact location of hymen ...kindly tell me about this