nellon, you sound like a real winner
Let me ask you this, do you get out a measuring tape and get the exact figure for every guy you have ever been with? Because if you do, then you are unlike everyone I have ever met for sex. You don't do that, because it would be weird...so I guarantee you that cocks below 8" have fucked you, even when you thought they were 8". At least you acknowledge that you are petty. Let me ask you another question: Might it be the case that people like you are part of the REASON that guys who are 7" (well above average!) feel compelled to say they are 8"? Maybe you are self-fulfilling your own prophecy. There actually really AREN'T that many guys who are 8", so you narrow the pool to an almost unusable number when you put that out there. Thus, guys who have big dicks, between 7-8, email you and say they have 8 because they know it is the only way to get in your pants.
If you want to get fucked only by an 8" cock, then the only way you will know that you get an 8" cock is if someone sends you a pic that seems to be real with a ruler or measuring tape next to their dick and it shows that they are 8". Some guys really take crappy photos and therefore their 7.5 looks like a 6 to you, some guys are skilled at taking over-emphasizing photos so their 7.5 looks like a 9 to you. Take a cock of any size on a guy of average height and build. That cock looks bigger on a short guy and smaller on a tall guy, bigger on a thin guy and larger on a fat guy. Uncut looks longer than cut. Thicker looks bigger than thinner.
I think pwrdick and exbiker are right as well, some guys can't measure well, and we are conditioned by the porn industry to think a certain cock size is 8" when it really isn't, so those are two more reasons people "lie" - because they haven't got the correct information themselves.
Of course bigger is always better, I totally agree
but I'm never particularly looking for "hung and extraordinary" - if that happens it's great, but I'm more of a top so I care a bit less and when I suck dick all sizes are fine (bigger is always better though). I hear so many times about people meeting and the guy doesn't look anything like the picture but that hasn't really happened to me that I can recall, honest, at least not to the extent where I would have left. I've had two specific experiences where the guy either wasn't truthful about what he was into or in reality didn't really know what he was into but had told me some things; those experiences sucked and ended quickly.
But there's really no reason to call people out about their cock shots; it's just rude. Just say no thanks and move on, or just don't respond to them once they send the pic. idk just my $0.02