Size doesn't matter at all, well, as long as it's not just a little button mushroom!
Girth is better than a stupidly long thing, that can just be painful.
But, if I remember rightly, it's only the first 2 inches inside that can feel pleasure, after that it's only pressure and pain.
I found that ''big boys'' tend to think that that is all that's needed, no frills and everyone is happy.

NOT THE CASE!
Blokes who are insecure about it tend to do everything they can to make sure the girl is pleasured so that alone is good for me!