My tip of the day is to remain absolutely calm and professional, almost pitying him when you speak to him and about him through the rest of this.
Let your superiors know, in front of him, that you were actually considering letting his sexually charged behavior "go" for the sake of calm in the workplace, but unfortunately he has opted to add unprofessionalism regarding your work product on top of his inappropriate behavior. With that, you "sadly" feel you have no choice but to come forward with all of his misbehaviors.
"We all know how difficult it is to speak unfavorably about someone. I've put up with his completely aggressive sexually inappropriate habits for quite some time and tried not to be a bad sport about it.
"But now he's taking this craziness out of the personal interactions and into my work product and even trying to cow me into signing something he knows is untruthful. Worse than sexual intimidation, he's now adding professional "bullying" to the pile.
"This simply won't do, I hope you all understand. He's was probably once a very good manager, but now I have no choice but to clarify to him and to you that all such misdoings will be spoken of aloud, immediately, from now on. Being quiet is allowing him to do more harm than good, so there you have it.
"Please accept my apologies for not speaking up sooner. I'm sure it would have spared others... or perhaps I'm the only one getting this special mistreatment. Either way, we know it has to stop, don't we? I truly hope it ends here."