no girls r not dirty instead ur mindset is dirty
girls mensturate because if the egg is not fertilized it descends to uterus .uterus prepare every month to recieve and nurture a fertilized egg .its walls become thicker and spongy to help in implantation.hence the egg is not fertilize it last fr about 1 day and the uterus lining slowly breaks down and comes out through vagina as blood and mucuos.
its okk
thnx sania
is ur nick name cool???
plz mark it as brainliest