For all the people who believe this chart, try to imagine the women in this survey actually having enough experience with dicks (with relevant measurements of each wiener accurate to the quarter inch) to be able to definitively say what the perfect dick is like. At best, assuming that they don't just have hundreds of male prostitutes with little tattoos on their cocks, it's a cross-section of random ladies shoving a couple hundred dildos up their twats, each precisely calibrated for length and circumference, that the scientists then have to throw away or at least autoclave between each lady who's involved in this survey.
Aside from in the context of hentai or a porn game where a lady can take infinite dicks of any size in her twat over and over and over again without getting tired or her clit falling off, no, that shit didn't happen. The same ladies who spend all their time reading porn stories about dudes with 8 inch dicks giving ladies perfect orgasms answered that that was the perfect dick length, and they (I'm going to just guess) thought that a reasonable 'big dick' length was a good big dick circumference, aka about 6 1/4 to 6 1/2 inches.
To be honest, dick size does matter at least some to some people. It's not the only thing that matters, but it would be a crock to say it's completely irrelevant. But as long as you're within about an inch of average (average is about 5 inches long, FYI), you should be fine. 7 inches or more, you might start to run into the 'unexpected' problem that ladies aren't having as good a time as they expect they would because you're a 'pain.'
In short: expect that if you're in the "A" range of this chart, most women you meet will not want to date you for very long because your horse cock is too much fucking work.