When was the last time you did something for the first time? 

最近一次尝试新事物是什么时候？  

例如：

When was the last time you kissed? 上次接吻是什么时候？（嘿嘿嘿） 

Lily: It was in Phuket last week. I tried banana boat and parasailing for the first time.  Lily老师说：是上个礼拜在普吉岛，我第一次尝试坐了香蕉船和水上降落伞。