NSFW video lotd

[killbox]

ok so im sure the point of this video is to titalate the average 14 year old boy.. (mostly because nearly all the sexuality involves images of women) but its almost more interesting to see the 1000's of frames that don't involve nudity/smut.. why is it so easy for the brain to spot in a blipvert(tm) style porn, in a video stream?

once again this link is NSFW (and probably NSF_u18)
http://www.youtube.com/watch?v=1-Br1F2XzN0