Definition
to pleasure someone by orally stimulating their genitalia using the tongue and lips
为（某人）进行口交
In a private setting, they decided to engage in more intimate contact, including going down on each other.
在一个私密的环境中，他们决定进行更亲密的接触，包括为彼此口交。
She felt that after the romantic dinner, they could take things further and go down on him in bed.
她觉得在浪漫晚餐后，他们可以在床上更进一步，为他口交。
The lyrics of the song refer to intimate acts between lovers, such as going down on each other.
这首歌的歌词提到了恋人之间的亲密行为，例如为彼此口交。