My Answer: Kabbalah recommends single-sex education beginning from age 2 to 3. The physiology and psychology of a human being, not just his soul, testify to the need of separate education. Scientists are finally beginning to recognize it as well.
Die Welt published an article by Wolfgang Bergmann, a renowned German pedagogue and family therapist. He states that today’s boys are girlish and effeminate. Little boys want to make noise, fight, gain their social position, and nevertheless be loved. But there is no place for this in a pedagogically correct female world. Boys become increasingly enveloped in female understanding; they are forcefully balanced and feminized. The world has become too small for the boys. It is too normalized, and boring.
What boys do especially well is not appreciated neither at daycare nor at school. The world of pedagogy has “conspired” to wean them from masculine traits. The boys become restless and absentminded; many suffer mentally, are hyperactive or depressed.