im not a lady but can answer this question honestly without trolling or bias. size does matter but to a certain extent. average in most cases is fine but just above average is better. if your just above average and know how to fukk you will be all set. small dikk havers not only lose from first impression of sight right on the spot but they also lose because they just cant hit the spots. big dikk havers might run into women who cant handle it all and for most women they can only get so much in.
the truth is that having a decent sized dink and knowing how to use it is key. anything 6-7.5 inches is ideal with some girth.
having a small dikk a girl will be like fukk he isnt all he was cracked up to be. having a above average dikk she will work with it and be happy only if you fukk her right. having a huge piece she will be impressed but might turn off when you are obliterating her walls in a bad way unless she is a size queen
i know this all from research and talking to women.