don't dip your pen in the company ink
A man is advised against messing around with any woman in his workplace as doing so can have very negative consequences that affects many aspects of his life.
Employee1: I can't believe our boss slept with her. He was demoted once everyone found out about it.
Employee2: The moral of the story is: "Don't dip your pen in the company ink, it causes nothing but trouble".
Employee2: The moral of the story is: "Don't dip your pen in the company ink, it causes nothing but trouble".