I understand that for the Jewish males, but not for the rest of us.
That depends upon whether you believe Genesis 17:10-14 applies to you, or not. If you subscribe to Christianity that feels that certain commandments in the Old Testament are applicable - then the answer is 'yes'. If not, then it's optional.
Besides Biblical (Christian, Jew and also Islamic) beliefs, there are medical justifications as well. I wonder if the Libtards realize yet, that they have insulted Islam? They insult Christians and Jews with impunity, because we are civilized. However, a Libtard is a cowardly bully at heart; when Islam says "Boo" the Libtards will fall all over themselves to appologize to a Muzzie.