(sigh) I know there are people who have masochistic tastes. However, why does anime, and manga always make characters, that take it to ridiculously over the top levels. It's not funny, it's creepy.
That's what many mangas/anime or even cartoons/comics have always been doing, exaggerating things, that's what they made for. And if it's creepy that's because masochism is creepy in itself (and for most people outside of this world), the exaggeration just exacerbate it; it's very well done. And I'm pretty much convinced it might not be exaggeration for some people.
Also, remember everything crazy that happens on the panels are actually in the characters' heads; and everything inside your mind is always way more intense than what it is on the outside.