What does it matter
By definition prossies have seen and had a multitude of cocks, no doubt bigger, smaller, wider and thinner than mine. Some that never cum and others that have released the load before the owner pants have been removed.
As far as I'm concerned I get hard and have sex, providing it feels good - i.e. she hasn't emptied a whole bucket of lube over my cock and up herself I'm happy.
I've had prossies compliment me on the look of my penis, the taste of my penis, how it feels inside them and expressed a desire to climb onto it as soon as it is hard or say that would feel sooooooo good in doggy, etc. One even said that I have the best helmet colour she'd ever seen.
Nice enough at the time, apart from the helmet one which was a bit odd, but it's all ego massaging that I don't believe any of because they've said it to the last bloke through the door and will say it to the next.