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I got dizzy once. Had to quit in the middle of sex and take a breather. It was hot in my room and we were enjoying vigorous sex. So after like 10 minutes we went back at it and all was good. Just drank a bunch of water during the break. So for me, I do better in a nice air conditioned room... getting old sucks but at least I still have some lead in the pencil!
It is possible that he could have a heart or lung condition and it may just be vertigo. If he huffs and puffs after walking up the stairs or walking period he should get checked out.
Time for update. I am pleased to report that my friend is not getting dizzy anymore (after sex). Following the advice from several other members they changed positions and that seemed to rectify the problem. However, his girlfriend recently started to complain about suffering from chronic fatigue.