It is absolutely safe to have sex during periods.There is only religious belief not to have sex during pregnancy
as woman is Dirty or UNCLEAN during this time.Although sex is safe from pregnancy point of view but your risks of sexually transmitted diseases and infections are higher than normal during this time because the cervix opens to allow blood to pass through. Unfortunately, this creates the perfect pathway for bacteria to travel deep inside the pelvic cavity. You are also more likely to pass on blood-borne diseases like HIV
and hepatitis to a partner during your period and more likely to develop yeast or bacterial infections because the vagina's pH during menstruation is less acidic. You can have safe unprotected sex during Mensturation and 3 days after completion of menses if menses lasts for 4-5 days.