Why do people always say "don't date/marry coworkers" yet, it always happens?

Lindsay lohan, married the executive producer for one of her movies, "irish whish". he also is now the assistant vp at credit suisse, meaning he's's a really good financier.

That still means though, that she married her coworker

Yet, people are always saying "dont date your coworker"

Why do people always say "don't date/marry coworkers" yet, it always happens?
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