Egg- That's probably too high. Measuring underneath is worse than pointing your dick down, as it not only stretches it out longer than its properly measured length, but you can fudge the start or end point depending on how far down the balls you choose to go. In addition to that, it looks like she's curved it over the head, so the start point there isn't accurate either. The guys at the start of this thread guessing 7 to 7.5 are probably right. With porn camera work, anything over 8 puts someone up there with the Danny D/Lex crowd, which you can tell he isn't in the videos.
Take Care