Rustolube
A makeshift lubricant used for anul sex with a woman. The ingredients include dried up period blood, vaginal musus, spit, and fecal matter. Ideally this mixture is possible when having bareback vaginal intercourse with a woman during her menstrual cycle.
Sven didn't think he'd get his cock in Gina's ass but then he remembered he learned about rustolube in the boy scouts.
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