Why do you know it's complete when you accept Xipazi?

In ancient times, unmarried women were mostly virgins. When they consummate their marriage, if something happens, they will definitely bleed. The western pie is put on the bed. If something really happens, blood will definitely leave a mark on the handkerchief. According to this, Galeries Lafayette can tell whether they are married or not. But nothing happened between May and Zhihua that night. In order not to let Galeries Lafayette know, Mei cut off her finger. Create the illusion that they have consummated their marriage.

Is that understandable? You can ask me if you don't understand.