Some adolescents might be more sexually mature and provocative than others.

有些青少年可能比其他人在性方面是更成熟、更挑逗的。

《柯林斯英汉双解大词典》

Girls become sexually mature earlier than boys.

女孩比男孩性成熟早。

《牛津词典》

A young horse is a foal. Foals are born to a mare, a sexually mature female.

VOA: special.2009.07.21

A sexually mature male is called a boar.

VOA: special.2009.07.21

The bear grew up, became sexually mature and aggressive, and attacked the man.

BBC: Why wild animals do not make good pets

Female sturgeon don't become sexually mature until their 20s and spawn about every four years, so the spawning season, in which they surface from the depths to lay their eggs on rocky shores, is an extremely important time for the species.

WSJ: Standing Guard for the Sturgeon