And after your comment is a quote wherein he says that he was referring to behavior.
I like to give folks the benefit of the doubt so I'm more likely to believe him. That is, that he was referring to behavior, but this a Catholic university - a place that, as I see it, should take a biblical stand on the issue. There's either more to this or the university is wrong to give any weight to the complaint.
The big question here, in a purely secular context, is what is it that makes us human?
Does human life have a biological purpose? Does anatomical function define this?
Sexual reproduction defines us as a species in the natural world. Natural selection and evolution are totally dependent on this. To do otherwise makes you less human.
Animals will defend their young with extreme violence, something too many humans do not observe.
I think what makes a person fully human is how they love and raise their children. Not doing this makes you less human...