To myself:
Split tongue, I find it really attractive.
Cuts, I love the taste of blood and the acute pain it causes if in very specific places.
Bdsm, bound to the point of total restriction, I could be raped, whipped, burned, electrocuted, pour in me ice and hot wax...

To others:
Amputation, either they are already amputated or I'm the one doing it.
Tears and eyes, I love when someone cries, it makes me so happy I just want to lick the tears and the eyes.
Knife play, cutting, stabbing, or just caress it's arousing.
Bdsm, extreme torture, to the point of making them cry, and beg for more or even for me to stop...