We really hate to do this to you guys, but as we've said before, ya just can't deny scientific facts. It seems a recent study has come along to support the notion that women, do in fact, prefer a bigger penis.
The Journal of Sexual Medicine is pretty thorough in their explanation and even offers some words of encouragement in case you aren't packing too much heat down there. The word bigger is never really dropped, so much as the word, "longer" is.
The study concluded that women engaging in sex with men who have longer penises are more likely to achieve a vaginal orgasm and thusly penis size is important to most women. This however does not include a clitoral orgasm, which is good news!
When in doubt, just keep practicing your hand and oral skills.