Its been known that watching porn too often (not saying you do, nor would I care) can lead people to get bored of seeing 'regular' porn. It no longer has that same excitement because its already been seen a hundred times, leading on to things that are more out of the ordinary, more hardcore to get the same satisfaction. I guess the same thing could be true with the mind.

I wouldnt be too worried about where ever its driving your thoughts, Im sure almost all guys have personal things that a out of the ordinary that turn them on. It just affects us with hyper sexuality a little more because having sex regularly is not even close to enough to keep our sex drive under control.