The 4B movement refers to "bi," which means, no, in Korean. The 4 Nos are no dating, no sex, no marriage, no childbearing. Look at the pictures in this article to grasp why it should be supported. Ugly, nasty, fat, angry females should be avoided physically. They certainly should not reproduce.
Rapid human evolution is on display in a walk around your local mall. You will see many pretty young women. If you ask one a question, they will be mannerly, soft and nice. They will want to try to help you. Contrast their fraction in today's malls to a picture of good looking young people in class pictures from just 40 years ago. Such attractive females have more sex, more climaxes, induce more climaxes, and bear more children (more fecundity). In a few decades, more people will be pretty, and nice.
This is a review of attractiveness and evolution.
