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The vuvlva swell during sexual arousal. This is what opens the labia. Orgasm and resolution allow the lips to return to normal. The thrusting and friction are likely causing her become slightly abraded as a result of insufficient lubrication. Similarly, when not well lubricated, each thrust opes and closes the opening of the urethra. This is a very short tube in a woman and the entire urethra becoms inflamed causing painful urination.
Switch from latex to polyurethane condoms and use a full applicator of vaginal jelly (K-Y+, Gynol II, Koromex) with some extra on her lips. You should be using this anyway as additional contraception.
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Brandye
Don't wear cheap bras!
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