I'm in the minority here, as I'm not a guy and I'm not a necrophile. If I came across a dead body, I'd call the cops! Well, after staring at it for a really long time and maybe prodding it with a stick. I've always had a morbid fascination with death and murder though. Probably since I was about 10. I used to frequently fantasize about killing people, but not in a sexual way. That's all they ever were, mere fantasies. I have no desire to have sex with a dead body, or to actually commit murder.
I love brutal death scenes in movies and video games though, as you can probably tell by my avatar, and once in a while I will feel a little exited from such a scene. Take Resident Evil 4 for example. It seems to me that every heterosexual girl who's played the game is absolutely enamored with Leon S. Kennedy. I'm the exception. Leon and his horrible one liners don't do it for me (though I'd gladly take him over steroid abuse!Chris Redfeild) but the psychopathic, chainsaw wielding Dr. Salvador stole my heart the second he sawed Leon's head off with his chainsaw. And thus my chainsaw kink was born!
Now as for my biggest fetish, emetophilia, I've had that ever since I was a very small child. When my brother and I were kids, he got sick a lot, but I never did, so I think that helped to sculpt my puke fetish. I didn't experience full blown arousal from it until I was 15 or 16, which I shall now describe. When I was a sophomore in high school, I was in my second year of Spanish, and I had a huge crush on my class mate, who was a senior. (Our high school required two years of a foreign language class to graduate, and neither one of us really wanted to take it, but we had to) He was kind of the skateboarder/punk type. One day, I noticed that he obviously wasn't feeling very good, and I watched him with immense interest. We were watching some lame video with a budget of about $20, and out of the corner of my eye, I saw him get up, cover his mouth and quickly bolt out of the classroom. I instantly felt very aroused, and I truly wanted to chase after him! Of course, that was out of the question, so I tried to kill my arousal my concentrating on the stupid video, but it didn't work. Even though I didn't get to see it, simply knowing that the guy I liked was out there puking was enough to get me wet. This was back in 2005, but I still remember it crystal clear.