Is it permissible for a father to lengthen his beautiful son's flowing hair—the son being 13 years old—in an era when the temptation of sodomy and the love of boys have become prevalent, given the father's desire to see his son beautiful and winning championships in Taekwondo?

There is no objection to letting boys' hair grow long, unless it involves imitating disbelievers or transgressors, or if it causes temptation for the boy and there is fear of his corruption. Protecting children from corruption is achieved by raising them with religion and virtues, and keeping them away from bad company and places of evil.