LOL, of course I followed this from the first post. Call it a meeting of like minds.
If there is no chance of this affecting your own career (and yes, people will chime in to say medicine is a small world and the chances of this are very low), it might be worth considering. If it's just going to bone you, I wouldn't under any circumstances. You might also consider how this might negatively impact the other party involved as well.
Anyone can report anything about any provider at any time, with no evidence, is the reality. What that ultimately means will depend, of course. Again, whether or not this is a good idea, or how seriously this is taken in light of weak sauce evidence, I couldn't say.
In fact, perhaps the best place to go would actually be the Medical Board. In fact, that would likely be where this would most likely receive actual action, at least in the form of actual inquiry, at least on paper. This may also be the most anonymous route. Although it would likely lead nowhere IMHO, besides a wrist slap reminder about how inappropriate it is to offer unsolicited medical advice outside the bounds of an appropriate doctor-patient relationship, that might be just what this physician needs.
OTOH, I would expect the program has the sort of dog-in-the-fight here not to give any ****s about it. They don't generally like to get their residents in trouble in any meaningful way if they can avoid it and it isn't necessary for covering their own ass.
If these two healthcare providers work together, at the same institution, and particularly if there is a supervisory component to it, then HR would likely take some sort of action. Even if it were only to document some sort of sexual harassment training.
I have seen this sort of abuse before, and I have seen it reported as well, and it did lead to some good in the form of the institution taking action against a sociopath. Ultimately the institution didn't accomplish all that it should have against this person, but it did have lasting career effects that were more than warranted, and while it didn't maximize patient safety, it did increase it.
You don't want to end this person's career, but if what you believe is truly inappropriate conduct for a physician took place, you have an ethical responsibility to report it, and that responsibility is not totally negated by you considering what effect this will have on someone's career. That is NOT your responsibility, but that of those supervising this physician's conduct. I say this given that is what I was taught in medical school.
OTOH, I was also taught that given what reports can do to a career, that there are certain things in the checkbox of "report immediately to the medical board," and that otherwise, it's slightly more complicated.
Depending on what the issue is, in a perfect universe, you might confront the person directly about their behavior. If you fear retaliation or that it might not resolve the issue, you go just right above their head. If that person is unable to bring a resolution, you keep going up the chain until you think it's resolved and your ethical responsibility is met.
I'm not sure that this is the sort of professionalism issue that is best dealt with in the "direct" route above, or with any of the authorities supervising this physician, below the program or the Medical Board.
Keep in mind as well, while this one instance may not end up going very far, and perhaps it shouldn't in the grand scheme of things, (perhaps this is just one lapse of this provider's judgment with another provider in the bounds of an otherwise ill-advised relationship), physicians with real professionalism issues have a pattern of behavior. It is only by documenting such lapses in judgment that any pattern can be recognized and addressed appropriately.
TLDR:
You can report anything about anyone at any time with no evidence.
Sadly, I say that you must consider how this might hurt you or the other party involved.
Ultimate consequences, what good this does, I can't say.
If you really believe this is a professionalism issue, (I believe it is), you have an ethical duty to take action, but that must be carefully considered.
Sometimes the only good this does is creating a data point that might ultimately reveal a truly unprofessional doc for what they are.