Furries tend to be intensely preoccupied with sex, and not in the way that teenagers and college students or even a lot of anime coomers can be. We're talking about viewing animal cartoon characters through a sexual lens, animals through a sexual lens, and all of their peers through that same damn sexual lens and doing it all of the damn time. Furries are a level above coomers in terms of their sex addiction.
This is not healthy for the human mind. While sexuality is a core component of the human condition, it is not the sole component, and contrary to what most furries tend to think, sex-seeking is not something you should base your entire existence around. The sex will get dull no matter how much you don't want it to, and as it gets boring, you'll start to seek out new ways to regain the thrill it once brought you.
This will, of course, lead to paraphilias. Ever more bizarre and disgusting paraphilias, based on whatever flicker of emotional trauma you felt in the past. Did you become frightened when you were a tiny child watching the blueberry scene in the original Charlie & The Chocolate Factory? You're in luck, furries produce tons of blueberry transformation porn based on that one creepy fucking sequence in that one ancient fucking movie. Did you once have a bad dream about quicksand? Fursuiters do videos of this shit. Were you so terribly neglected that the only way to get your parents to pay attention to you was to shit yourself? Bring on the diapers. Did you ever, by any chance, imagine what it might feel like to have the opposite sex's genitals? Go on, you know you have, you know you want to try it, just start thinking about it all the time and get everybody around you to play a part in maintaining your fantasy, now start taking some pills...
Furries are not happy people; they're generally scrambling desperately to squeeze whatever pleasure they can from each other at any price. Dante's Inferno described the second circle of Hell as being the eternal dwelling place of those people who put sex before everything else in life. The second circle was one enormous tornado that all the poor souls were caught in, thrown around randomly in every direction, crashing suddenly into each other and being yanked apart just as suddenly, going everywhere and meeting everyone but enjoying nothing, made eternally tired and miserable by it all. It was, like much of Inferno, pretty damn fitting.