This is very clearly a case of the professor being unprofessional and exploitative of his position of power.
This is very clearly a professor acknowledging the problems that arise due to interindividual biology in work environments. Unlike PC supporters hiding the issue under the blanket of professionalism.
Somehow, most people manage to figure out that this kind of behavior isn't appropriate, and hide the issue under the blanket of being-a-decent-human-being.
I don't understand how dealing with sexual or romantic feelings is any different.
If someone is incapable of managing their feelings in a workplace then maybe they don't belong in one, and their colleagues should not be the ones who are punished for that.
I don't expect you to agree with me here.