Wow. Sort of blown away by that chart. As a few people have mentioned here, it looks like it's a pile of steaming hot sh*t.
First off, creating such a chart in general is, in & of itself, never going to be accurate. When it comes to sexual acts, whether intercourse, Oral Sex, Anal, etc. each woman [ or man ] is going to have a different preference.
Making a chart like this is like making a chart for something like ice cream. There is no "perfect" ice cream flavor. Every person likes a different flavor, some chocolate, some vanilla, some with oreos, some with sprinkles, some like more, some like less etc. etc. Same with penises, tho I'll add that penises are much simpler. All you have to know is how to use it, & you're good to go. Trust me on this, size isn't going to make or break it.
Second off, 99% of women don't really know what size a guy's cock is or what they prefer unless they've measured. All the women I've spoken to greatly exaggerate cock size OR underguess cock size. The only thing a woman can probably tell & measures by is 1. her hands & 2. her mouth. Now, since every woman has a different sized hands & mouth, it doesn't make for an accurate description, does it? Especially when you consider some owmen can deepthroat, some cant, some push closer to the bone with their hands, others barely grasp it, etc. etc.
Third, a big cock might be nice to LOOK at, but looking & feeling are two different things. If it's too big to COMFORTABLY go in all the way, then guess what? It's not going in.
Fourth, all cocks are different. Period. Just like all vaginas are different.
What I'd like to see now is the "perfect sized" vagina chart. LOL Really guys, this is all a load of BS, & I hope none of you out there are taking it seriously