Dear Prudence: I just discovered what my father really gets up to at his office. Oh my god.

Dear Prudence is Slate’s advice column. Submit questions here .

Dear Prudence,

The other week, I had come to drop something off at my father’s workplace and drove a couple of blocks away after leaving when I realized I had forgotten my phone. I returned and got my phone only to hear strange noises coming from his office.

When I opened the door, I discovered him screwing his secretary on his desk! I fled.

Now he is pleading with me to keep my mouth shut because he claims my mother will take him to the cleaners in a divorce. As disgusted as I am with his behavior, my mother and I have never particularly gotten along. Should I look the other way? Given that I am an adult, is it even my place to stick my nose into their marriage by telling her?

—Office Eye Popper

Dear Office Eye