For example, the receptionist at work that was very flirty with me and then at a company function sat on my lap and kissed me on the cheek (even though I was married then)? Wrong on her part, but not assault.
When another male co-worker tried to corner her in the parking garage and kiss her? Yeah, that's an attempted sexual assault. (I only heard that story later when we were all comparing notes after the douche bag was fired for another reason)
I'm interested in why you think the secretary's actions towards you were not sexual assault but the co-worker's actions towards the secretary were.
Toni has done a very good job answering, but allow me to pile on...
First off, receptionist, not secretary. Second, she was not being threatening. She was a little drunk, and honestly if I were not married I would have been more than happy to reciprocate. All she did was made me feel a little awkward.
The guy who cornered her in the garage was a solid-gold asshole. Not long after he moved to town, he hooked up with a married woman, had his own divorce lawyer help her extricate herself from the marriage, and then cheated on her within weeks of their own wedding. I was in the studio once when another employee (the married sister in law of another co-worker) walked in and he began aggressively hitting on her. I went back to her office after the incident and apologized on behalf of all men.
And again, it's a pattern of behavior. The receptionist was young and tipsy at a party once. The asshole was sober, aggressive, and clearly felt entitled to whatever he wanted from her because that behavior had worked for him in the past.
Note the difference. That's what seems to be at work here. We've got one so far unconfirmed account of sexual assault from a Presidential candidate who has admittedly been a little too "hands on" at times vs two dozen accounts of sexual harassment/assault from a Presidential candidate who has literally bragged about his actions on tape. Repeatedly.
Let's take this one carefully, but keep it in context.