xD Never thought of Rihanna's song that way. Like Darkside said, it's a sadist (one who enjoys causing pain) paired with a masochist (one who enjoys feeling pain) and actually shows up a lot in manga. Or, at least the ones I
read find
I guess I really found out early on through M to N no Shouzou, which is pretty harmless and recommended, except not really because it hasn't been updated in forever and is probably scanned and will probably put you through tons of unneeded stress if you're the type who goes into hysterics when you have finally found a manga you like but realize you'll never get more of it or even see the end or...
eh. TMI?