My DH just asked me this question and I was just curious about what you all thought.
When he asked me I thought back to the first time current DH and I had sex. When I first saw his penis I was really disappointed because it was much much smaller than my ex-DH (I obviously didn't tell him this) and I always thought size mattered. But once we finally had sex it was so much better than sex with my ex, even though I was expecting the worst.
So does it matter to you? Is it the size of the penis or how well he knows how to use it?