Ancient Roman women would use the sweat scraped from gladiators' skin as an aphrodisiac.
Romans didn't use soap; they preferred to cover themselves in oil and then scrape the accumulated sweat and dirt off themselves with a sharp tool called a strigil.
Many aristocratic Roman women would have had the hots for a specific gladiator (in much the same way as people have crushes on celebs today), so they would buy their gladiator's body grease and use it as a moisturiser and lubricant.
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Historical Facts
De TodoHistory is pretty interesting to know due to the mysteries it carries.