to me, the term "harassment" means repetitive, morally painful actions from a boss to his employee. Obviously the guy has a huge problem with his sex life, but why report to HR instantly , instead of trying to see if the problem is that big and can't be solved by a person to person conversation, like grown up, first ?
EDIT : i'm not trying to be a jerk, and justify the behavior of that guy. I'd just like some woman working in tech in the US to explain to me what's wrong in my scenario.