Fortunately we don't have to speculate because the professor herself explains why:
> Some of the young students in my class take up these offers, and this further demoralizes other female students seeing this happen (i.e. only attractive women being offered tutoring sessions).
The more attractive women are receiving all the positive attention, and the others are hurt by this. Which is completely natural, but...welcome to the world. Life is unfair, and being attractive opens doors that aren't available to others. Are people obligated to show equal interest in everyone, regardless of their actual feelings towards them? Men who expect this from women are usually derided (and rightfully so) as "incels".
> Some of the young students in my class take up these offers, and this further demoralizes other female students seeing this happen (i.e. only attractive women being offered tutoring sessions).
The more attractive women are receiving all the positive attention, and the others are hurt by this. Which is completely natural, but...welcome to the world. Life is unfair, and being attractive opens doors that aren't available to others. Are people obligated to show equal interest in everyone, regardless of their actual feelings towards them? Men who expect this from women are usually derided (and rightfully so) as "incels".