Last night, I was talking to my girlfriend about the possibility of using some new toys. At this point, she told me that a new vibrator would be interesting but that it could not be thicker than my own penis, because my 5.25 inches is already her upper personal limit, especially considering that a dildo need to be a bit smaller on account of the material used. What do you think about it, girls? Does the material make a difference? What is the ideal circumference for a dildo and cock?