if a fella is enormous it is just plain painful...if a man is too small and can't hit the spot then well I mean that's pretty self explanatory...I'd say 5"-7.5" is good for me...BUT, everyone is different...if a gal had a BF for 10 years that was hung like a mule then a guy that is hung like a Mississippi mud skipper probably couldn't please her...just be happy with you 6.5"...obviously it gets the job done ;o)

size probably doesn't matter as much, though bigger may be better.  If she doesn't like you, or she's been overworked, and she's a provider, she's probably grateful if your small and it's kind of ominous if you're big.  just a guess from a guy who is relatively clueless about women in general and trying to figure it out.

for women who prefer deep penetration -- it depends on where their cervix sits, and cervical position varies depending on the woman, how relaxed or aroused she is, and where she is in her menstrual cycle.  (feel free the check out the enclosed link for more information.)

for women who are not terribly concerned with depth of penetration, girth is often more important than length (which makes some sense as most of the nerves stimulated during penetration are close to the vaginal opening).  for some women (those who prefer a greater depth of penetration, as the sensation of pressure on one's cervix can be pleasurable to some), length is likely more important.  some women prefer other activities to penetrative sex, period, end of story, so they may prefer a smaller package overall.

ultimately, it depends on the woman.  i realize that may not be helpful.  LOL.

My Penis is soooo awesome... please tell me how mine is so much bigger compared to your average client...  did I mention that my penis is so awesome?  Maybe if you are lucky, I will send you a picture of my penis and then you will get so excited thinking about it, that you will call me to come over for free on your off nights.  I will bring some Michelob Light for you.

I'm not a size queen YET I have a size preference for certain positions. Bigger (longer rather) penises make riding cowgirl or reverse a lot more easier and fun, the longer and thicker even the better (for me) for variations of K9.  But one occassion where a man was a good 10 in length rock hard and thick too worked me out in missionary legs cocked back as far as they could go (and knew what he was doing with it) and I thought I would die lol.   So small, medium and large can have it's pros and cons imo depending on what's being done. 6.5 is what I comfortably feel most ladies would consider just right in length anyways.

Hmmmmmm

In my personal life, the bigger the better. In a life of a provider-I like small cocks that comes fast. 100% truth, sorry.

I mean, it's not like you can pick your teeth with my pee pee...

since most women do not reach orgasm tru vaginal, size does not matter