Unwelcomeness: What Does It Mean?
Sexual harassment takes a wide variety of forms, some mild and others severe. The behavior may range from a harmful joke to physical assault. Whether a particular behavior is defined as sexual harassment depends largely on whether the behavior is UNWELCOME to the target.
Unwelcome behavior is just that; it is behavior that is not welcome, not solicited and not wanted by the offended person. While you may perceive your behavior to be friendly and harmless, a co-worker or student may find the behavior offensive, so it is important to think before you act in a way that could be reasonably perceived as sexually offensive.
Most adults who pause to think about it can distinguish between what might be perceived as welcome and unwelcome behavior, especially if they think carefully about how others might react.