Heavy stuff, enough to turn you off:(. How about it is jsut a physiological thing and that there is nothing wrong with it. I think it's actually healthy!!!
when you consider the mind is the most powerful organ/tool controlling the body, it's best to have it under control.
look at serial killers, molesters, rapists, etc. many of them are single and they commit sexual predator sins because they don't control the mind.
i think classifying it as sin is good. because having your mind under control is not just better for you, but for those around you!!