Why does feng shui master taboo female physiological period?

In traditional geomantic omen, fragrance is emphasized. In addition to the literal meaning, "Xiang" also has the extended meaning of "descendants". If a woman's menstrual blood is scented, it may lead to the association of abortion in the future; In addition, most people think that it is blasphemy and disrespect for ancestors to touch incense through menstruation.