I used to have this male coworker whose wife forbade him from eating with any female coworker. Even if there were 20 female coworkers and him, he could not do it. She explained that a former boyfriend had cheated on her with a female coworker and she thought forbidding him from eating with the opposite sex would, somehow, prevent that from happening. A few of us thought it fell under the heading of "The lady dost protest too much."
Not gonna lie, that restriction caused him a lot of work-related problems and led to his downfall here. We do a lot of business over lunch and breaks and if you choose not to go to them f or whatever reason, you find yourself out of the loop. He ended up leaving here under a cloud and then found out that the whole time, she had been cheating on him. With another woman. So that whole business about forbidding him from spending work time with the opposite sex was a red herring, given that she cheated with someone of the same sex.