性成熟

dào le fǎ dìng xìng chéng shú nián líng de chéng nián rén sī xià li gàn shén me shì tā men zì jǐ de shì

到了法定性成熟年龄的成年人私下里干什么是他们自己的事。

What consenting adults do in private is their own business.