Personally i think 6.5 by 5.5 would be perfect for my vagina. I haven't had a dick under 6.5(ish) in girth in 12 years. So i truly forget what it must feel like. The other night we were having sex in a position that made his dick feel like 10 inches as far as i was concerned. I couldn't take the entire length for very long. It was uncomfortable to have im wanting to pound me and 5 inches would have been plenty of length for that position.
I like sex where he can thrust as hard as he wants and i am enjoying it. Most of the time in missionary this isnt a problem. But for doggy or me on the bed and him standing up, its painful to get anywhere near the entire length.
The girth is an issue for me, but I wonder sometimes if i had a much less girthy dick if i would enjoy it after all this time of not knowing any different. It would be nice not to have to use tons of extra lube, worry about tearing and have more spontanaity.
BTW: this sticky thread has made for much less length/girth new threads and the new thread questions are far more unique and interesting.