The more I have sex with different girls, the more I am sure that I am objectively correct that my penis needs more girth and has sufficient length. All the girls I have sex with lately are very wet, and I notice that I just have so much space left when they are wet in between my penis and the vagina walls (I’m 5.3” girth). However, girls generally love it the most when there is a tight fit because you are hitting their clitoris/g-spot more. One clear indicator for me is that they start moaning more when I cheat a bit by taking a position that has a tight fit (for example crossing their legs while in missionary). This is a clear signal that they wouldn’t mind more girth.
I’m thinking 6” would be perfect for 90% of the girls, and that is therefore my goal.