My girlfriend found out when she snooped around in my skype. I was chatting with a girl that had a guro fetish aswell and that's when she confronted me with it.

Long story short. I didn't tell her what i was getting off to specificly, but she's cool with it. She once said "i can understand [why you do this]. This is very well drawn and the girls are perfect." She does have a thing for chocking during sex or me being rough (not harming rough though). We are still together although that happened a couple of months ago.