Between her legs
Dirtiest place I've ever had sex was between my girlfriend's legs. She'd been on a 6-day backpack hike with other women, and upon returning all sweaty and muddy, she asked me to eat her out. Her crotch was unwashed from the long hike, musty, dirty, sweaty, and smelly, pubes matted and stringy, labia hot and slimy. But I manned up and gave her a good tonguing, honoring an earlier promise to eat her out anytime, anywhere.
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