No, it doesn’t.
Asking a colleague someone on a date may be an “unwanted advance” but that is not sexual harassment. Even asking someone on a date and having them decline multiple times is not sexual harassment, so long as the asker is polite and respectful about it.
Sexual harassment is a fairly high legal bar in the USA. You can sue for just about anything, but if you want to win you need evidence of truly bad behavior.
Which is as it should be; convicting based solely on the accuser’s testimony is not fair no matter the crime.
Source: recent all-hands corporate training session held by an employment attorney
it's not always so clear cut though, for example if they decide to quit as a result of the advances, then it could count as sexual harassment due to the adverse employment decision. Admittedly you're completely right about winning. You're not going to win a lawsuit because Sally politely asked you out once, but maybe if she "politely" badgered you every single time she spoke to the point where you were not willing to work with that person any more, and that caused you to get demoted.
Usually someone has to be a dirtbag, but some people think they're not dirtbags when they totally are dirtbags. That's when HR disasters happen and the accused weave some tale about how they were totally innocent when in reality they were shitty people creating a hostile workplace otherwise the jury would never have voted the way they did.
bob: "Oh but you said asking out was okay" HR: "yeah but uh your version of asking out was putting your balls on their desk and saying 'hey babe you know you want this'" bob:"Yeah but there was nothing rude about that, babe is a compliment"
bob@thePub: "I can't believe they fired me you ask a girl out and all the sudden it's sexual harassment"
you know who I'm talking about.
Different cultures are different. Sex isn't inherently evil or even taboo. Military guys hit each other in the balls on a regular basis.
The only absolute here is that you shouldn't continue some behavior you know is unwelcome. It's entirely possible Franken was abiding by this rule.
In terms of the Franken stuff specifically. The woman was known to make jokes similar to this. How can it be harassing if she wasn't even awake for it? Not to mention harassment is sustained, not a single instance. He didn't touch her, and she wasn't aware of what he was doing. The photograph is in no way showing her in a negative light. As far as I'm concerned, he did nothing wrong. It just seems like good natured humor that might be skirting along being inappropriate, but only for people with a stick up their ass.