sexually matured

例句：

1. 1. The adolescent boy is sexually mature at 14 years old.
   这个青春期的男孩在14岁时性成熟。
2. 2.Sexual maturity is a complex process that involves many physiological and psychological factors.
   性成熟是一个复杂的过程，涉及许多生理和心理因素。
3. 3.The study of human sexual maturity has important implications for understanding the development of human behavior.
   对人类性成熟的研究对于理解人类行为的发展具有重要意义。