I have 9 inches.. not real thick though.. just average thickness.. but I've never gotten any complaints
Maybe an ouch every once in a while.. but other than that... it's all good
The difference is you can control how much you use. You don't have to use all 9 inches. You can go in halfway or three quarters, and if they want it deeper.. well then you got it covered! I could rarely even go all the way in with my ex, unless she was near her period.. in which case I think the cervix moves up a little giving some more room in there. Hehe.. I liked to tease her with it.. giving 1 inch, 2 inches, 3 inches.. until she was begging.. and then BAM.. 8 or 9. If you have 4 inches, well.. you can only go in 4 inches.
All in all I think size does matter to an extent.. but it's much more so how you use it. It you got the size, and you know how to use it, well then, you have a happy lover.
If you have a huge cock and you just pound away, you are gonna cause more pain than pleasure. I learned my lesson the hard way when we got a little too passionate and in the moment.. and I was pounding away.. and the next day she was bleeding
.. and not from the monthly cycle. So ya gotta be gentle with the monster, sensual.. master of your domain, control and rhythm and smooth flow. Think of how she feels, make sure she feels good and always get suggestions for improvement. Put her pleasure above your own.. it's easy for guys to get off.. it takes some work to get the females purring. That way, there's no OUCH, and lots of OHH YESS.