From a business standpoint, dating in the workplace can often be disastrous, particularly if it results in loss work hours, or acrimonious break ups that lead to workplace disasters. An employer can prohibit dating in the workplace, so long as the employer enforces the guidelines consistently – that is, against everyone. Whether dating is allowed depends largely on the workplace policies, and is not governed by statutory laws. However, if there is a policy against dating in the workplace, it is a legal cause for termination.
I read this on legal-database.com