I'm 6" long with some nice thickness...at least that's what my wife says.

If I were longer, my wife said she couldn't take it all. Even I had to back off a little because I hit her cervix on some occasions.
We also have to watch how rough we get during sex. My wife has a tendency to rip at her perineum (the space between the vagina and ass hole) during rough intercourse.
She says I can get too thick when I'm really aroused.
My wife is Asian but she is not tiny as you would expect. She is actually 5' 9" tall with a thin model like body so you would think she could take more length from a guy.
I seem to be all she needs so that makes me a happy guy