okay, over the winter I was seeing three guys simultaneously.
one guy was about 7" long and pretty decent thickness, I never measured. he had a nice sized cock head and the angle of his fucking was such that he would rub against my clit with his pelvis in the missionary position. drove me crazy! so sometimes it was awesome, because every fuck with him was thorough and delicious. but sometimes it was just too much cock and would hurt. also, sucking his cock was more difficult.
one guy was about 6" and on the thinner side, but with a magical thick part up near the head which felt incredible thrusting in and out. it was a less intense fuck than the guy above, but it was really good and made me moan and squirm endlessly. I don't know why but the shape of it was just awesome. aaaaand he had amazingly smooth balls. he was a joy to fondle and look at because his package was so picturesque, and sucking an licking his cock and balls was immensely enjoyable.
one guy was maybe 6", maybe closer to 5. he had really big balls and an incredibly thick shaft, so thick that it almost didn't fit in my pussy. I'd have to be really wet and horny to slide it in easily. but when it was in... oh my god! it was heavenly. he filled me up and stretched me out. the best was when I had my legs stretched as far as they could go so he could get in s deep as possible, but he still wouldn't be deep enough to hurt. I think his cock widened more at the base so it just stretched me out more and more.
... I got a little too excited writing all that
the moral of the story is, there is no one perfect cock. the myriad of shapes and sizes is a blessing.