I'm almost numb
Sometime during puberty, I lost all feeling towards other people. I don't really feel desire, or any other emotion. Or at least they are EXTREMELY dulled. I've been asked out by girls before, but declined because I had no attraction. I can still have sex like any other person, I still have physical feeling, but I haven't been in any relationships. Most of the feelings I display are just what I know I should feel if I could.
As for arousal, aside from physical contact, it takes some pretty extreme circumstances to get me there. This has led to me becoming a sadist. It's really the only thing I react to. You could probably curb stomp a newborn into chunky salsa in front of me and I'd feel nothing. How many other people have become dull to average stimuli?