In the past, research that attempted to determine the importance of penis size in the eyes of women utilized 2-D drawings and descriptions of size. But a more recent study, using 3-D printed penises, has shown that women do, in fact, prefer something a bit bigger.
But just a bit. It turns out that the "ideal" size is actually not that much bigger than the average penis.
To read more about the details of this study, click here.