How come Bill Kaulitz has a girly singing voice?

Bill Kaulitz, the lead singer of the band Tokio Hotel, is known for his unique vocal style, which some may describe as having a "girly" quality. This is due to his high vocal range and falsetto technique, which he uses to create a distinctive sound. It is important to note that vocal timbre is a complex and subjective aspect of singing, influenced by factors such as anatomy, technique, and personal style.