If you love each other, why not get married?

要是你们彼此相爱，干吗不结婚呢？

《牛津词典》

No, we're not talking about why women get married, but why women cheat on the men they have married.

我们这里要谈的并不是女人为什么要结婚，而是为什么女人们要对自己所嫁的男人不忠。

youdao

The institute said in a statement that one reason why living together can not last as long as marriage is that 51% of living partners get married within three years after they have moved together.

疾病控制中心在一项声明中说，同居不如婚姻长久的一个原因就是，51%的同居伴侣在(同居)三年内就结婚了。

youdao

But researchers did not directly ask participants why they did or did not get married, Kadan-Lottick said.

CNN: Study: Childhood cancer survivors less likely to marry