I Don’t Understand Why We Still Have To Do This To Our Sanitary Pads. It Makes No Sense At All

If it is something that half the population goes through every month, then why is it such a big secret? We are talking about what is considered one of the biggest taboos in our society: periods. Yes, PERIODS, the normal monthly cycle that every woman goes through. Then why all the secrecy and stigma around it? Why can't we still talk about it openly without any hesitation?