One girl I remember had this particular smell was an ex GF who had a constipation problem. Constipation and unclean arseholes go hand in hand cos they can't pass it out cleanly. Some of it stays there. It's pretty farked up bro.
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If the smell of the girl is going to make you hurl, time to swirl and twirl and run before it costs you a pearl.
Had this once with my ML, bro, the smell was off the charts , still can remember it till now. She later found out she forgot a tampon inside pussy for a few days