I find that situation pretty interesting.
because if you dehumanize someone then you are essentially fapping on your refrigerator.
Yes it may still look like a human but it is not a human.
In general, it looks like something more related to domination and a sense of self-worth and security or maybe hate.
In my situation, the problem with my tastes was that I see them as something extremely stupid and it still sometimes looks stupid, because when you rationally think about something like cannibalism you just can't understand the reason why one would want to cook a cute girl and what do you do next. Same about other stuff where it is just so stupid and pointless even if it looks sexy.
but that's a typical problem with all sex stuff because whats we do is totally absurd and pointless.

As for being psyho, I think that is what every respectable human should be able to turn on demand. Maybe some training is required.