Ladies, are you in pain during and after sex?

When my wife and I have intercourse, she always complains about her labia (lips) burning afterwards, but we don't know what the cause is. We've seen a few female doctors, but all they've done is guess, and guess wrong. When my wife and I finish and I pull out, she is almost in tears. When I perform oral sex on her (which is quite frequent), she orgasms and there's never an issue, but it always seems to burn like hell during and after intercourse. I'm not that big of a guy (6"-7" erect), so I don't think stretching her lips the cause for the burning and discomfort. Is there anyone here that experiences anything similar? If so, do you have any advice or remedies?

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