Hate to break you to bud but a woman can push a baby out so I don't think any cock would be to big for them
actually, just like guys dick size, women have different lengths and widths to their vaginas, so it is entirely possible for a guy to be too big for a girl.
cjay.... while your dick is definitely nice and above average, only your girl can tell you if your too big for her. If so, it is possible that with practice you guys can stretch it a little bit more to make it easier, but just dont push for it too hard.