having pain in right abdominal area when having rough sex

It sounds like his penis might be hitting your cervix when he penetrates deep.

Peoples definitions of things vary - I suppose for your definition of rough sex we can read vigorous sex?

Women have told me having any sort of vigorous sex with their more well-endowed partners has been anywhere from completely impossible to downright unpleasant - one woman told me any sort of sex with her man was like being impaled and all she could do was wait for it to be over and comfort herself with the knowledge she was doing it for him...

Your fellow is probably penetrating too deeply and when you use a postion that allows or encourages deep penetration he should limit his strokes as far as he can - of course taking that much care isn't really the idea of rough or vigorous sex and expecting a guy who is approaching "the vinegar strokes" (when animal instinct entirely take over) to take care is asking a great deal of any man.

I have read of well-endowed men wearing a collar around the base of the penis to prevent deep penetration in the same way animals had to during the bestiality demonstrations in europe's travelling fairs of past centuries when women publicly performed with a variety of animals to earn their daily bread...

I knew one woman whose arms were long enough to be able to reach her man's penis during sex and use it as a collar or an extension of her vagina to prevent deep penetration. Her hand also added considerably to his sensations and sometimes she was also able to stimulate herself at the same time...