Ummm, why?
Contrary to popular myth among guys and even some girl talk the actual reality is too big does exist. If the woman you are dating is asking for bigger you have to be asking how many truck drivers have been through that tunnel before?
Also most women really do not want dick picks of even the guys they are with let alone some stranger. The woman attracted to a guy because of an overly large penis is generally a woman who has again probably seen way too much action.