Actually size shouldn't matter. Sex is an activity that two people share. And as it's been stated, It's the attitude of the persons involved. Some idiot with a 20 inch dick thinks all the woman would die for it.... Well think again Johnny Holmes...

My size varies, depending on how turned on I am. I can range in lenth from 6 1/4 to 7 1/2, depending on my mood and partner.
(Actually I think it shrunk from getting wet)

Many, many years ago (back in high school) I had sex with a friends sister. She was so use to using pop (& beer) bottles that her pussy was way stretched out. One could have parked a truck in her and she wouldn't have noticed. (and you would have lost the truck!)

then I have enjoyed sex with a woman who's husband was much smaller than I and we both enjoyed it. (she felt filled and I felt the wet tightness of her)

So again, it's how you use the equipment you have to get the job done. Enjoy every session as if it will be your last!