I echo ngdawg....Im one of those women that is "short" inside, anything over 8 inches hurts like holy hell no matter what position Im in. Hell Dave still hurts me sometimes at almost 8...doggy is only possible for us if Im drunk enuff to ignore the pain (or unless Im the one fucking him with our strap on
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I'ts been my experience that on top is the best position, for me, for a bigger guy (length not width), though I've been known to not let a guy have sex with me because I knew it would hurt so I'd just orally please him instead (dont seem to have a problem doing that no matter what the size)