Is This Chart for Real?

While I, like most women, admit to only a limited amount of sexual experience, I find this chart on-line to be extremely far-fetched.  I can understand that a too-large penis would hurt, and a small one might be sad, but the A and B range just leaves me confused.

I have never encountered a chap with a seven-inch penis, and I have been to some nude beaches.  (I keep my bottom on in those settings.)

But this implies that the best size for male members is 7 to 8 inches.

I cannot say that I have ever been disappointed.  But maybe in making the love it is not the size of the pénis, but how the guy does the other things.