About 8 length and 6.5 girth. I can take more on both numbers but am limited in my postions for a penis that is longer than that (I can take up to 10 if I am on top but it isn't as pleasurable as 8 inches). Add too much more girth and an additional 15-30 minutes of foreplay would be needed just to get the head inside me. With 8 inches I can lay back and take a good banging all the way down to the bone and enjoy the balls slapping my ass, but not beyond that. Also, length without girth isn't as much fun either. If there is too much girth, well you just cant get it in. It's something like Goldilocks... just right

One of my best friends loves girth but can only take 6 inches in length so her 6x6 boyfriend is the perfect size for her.