have it off

乱搞男女关系

例句与用法：

People are whispering that the director has been having it off with his secretary.

人们在悄悄议论经理和他的女秘书一直有不正当的关系。

She was having it off with a neighbour while her husband was away on business.

她在丈夫出差时跟邻居发生了性关系。