Appreciate your politeness in a such controversial topic. Apparently, when the both persons are already in a romantic relationship, or are spouses (which can h

Appreciate your politeness in a such controversial topic. Apparently, when the both persons are already in a romantic relationship, or are spouses (which can happen in a family business) it's not harassment. Thus, whether such offer is harassment or not is based on a subjective judgement of each party, rather than some hard-coded rule. In the case described by the author it was clearly harassment because one party perceived it so. Even when it's not harassment and wanted by both parties, it still can be undesirable from a professional ethics perspective as it can affect morale of other employees. So it leaves very few cases when it's acceptable, but they do exist.