1. The co-ed system is more natural.
The world is not a single-sex society. Students need to know how to communicate with the opposite sex. Especially, those who have grown up with the same sex siblings should be taught in a co-ed school.
2. Equal opportunity for education
Men and women have their right to be taught under the same curriculum. Since women have a keener hearing sense, they are encouraged to take a back seat. Men and women are said to think and feel in a different way. However, the single-sex education will only isolate the students' gender roles. Traditionally in Korea, men have been grown up to be strong and tearless in any situation while women have been grown up to be weak and passive. In the Choseon Dynasity when few women were educated, it was easy to teach men and women separately. However, we're living in a society which prefers those who have the properties of both sexes. Companies hire men who have a high sense of empathy and women who have strong leadership.
3. Sexual desires
It is natural for teenagers to be curious of their opposite sex. Co-ed schools provide them with the chance to get along with the opposite sex, dissolving their fantasies of the opposite sex. On the other hand, students who were taught with the same sex for a long time can have suppressed desires which lead them into abnormal behaviors.
Pregnancy rates mainly depend on the efforts of the schools to provide sex education of high quality.
4. Academic achievement
Most of the students in a co-ed school said that the opposite-sex friends don't distract them from studying according to the survey done by Kim, Wonjung (2003). Since it is said that women are good at language while men are good at math, their academic achievement can be the utmost when they cooperate with each other.
5. Women power
Female students in a co-ed school are more active in expressing their thoughts than those who are in a girl's middle school according to a research done by Kim, Minam and Jo, Okgwi.