There is a clear line in most cases between mutual attraction and a consensual exchange and unwelcome behavior or pressure for an intimate relationship. A friendly, interaction between two persons who are receptive to one another is not considered unwelcome or harassment.
Employees are free to form social relationships of their own choosing.
However, when one worker is pursuing or forcing a relationship upon another who does not like or want it, regardless of friendly intentions, the behavior is unwelcome sexual behavior. An employee confronted with these actions by a co-worker should inform the harasser that such behavior is offensive and tell the harasser to stop. You should assume that sexual comments are unwelcome unless you have clear unequivocal indications to the contrary. In other words, another person does not have to tell you to stop for your conduct to be harassment and unwelcome. Certainly if you are advised by a co-worker that your behavior is offensive, you must immediately stop the behavior, regardless of whether you agree with the person's perception of your intentions.