Normally I don't look at dicks, but I am a sucker for shoop da whoop stuff. This photo has been altered. Nyne you suggest that the odd line in the pants is just a strange fold? When is the last time you unbuttoned your pants and the button sheered? That part of the photo has been pushed back.
This is what he did, he took the picture. Then in photoshop/pain selected part of the ruler and dragged it backwards He was sloppy though and selected a height that was too large, which is why the pants are sheered. Also if you look closely at the very edge of the ruler, the part that is touching the phallus, the notches don't match up, further proving he pushed it back. It looks like about a half inch based purely on the pants line. Also it looks like he is jamming that in there pretty good. So based soley on that, I'd say he is 7" tops, there could be some other tom foolery in there. For example. He could cut the end off of the ruler, since it is obscured by glare you can't really tell if it starts with 1 inch, but that is pure speculation.