我用比大姨妈还红的心来爱
[wŏ yòng bĭ dà yí mā hái hóng de xīn lái ài]
This netizen expresses that they love with all their heart ('big aunt' is the euphemism of menstrual period; saying even menstruation has redness but less than the intensity of my passion) which means loving passionately beyond words.