https://www.esquire.com/uk/culture/a34736481/tampongate-scandal-the-crown/

"...Charles telling his then-mistress, Camilla Parker-Bowles, that he wished he could be reincarnated as a tampon (so he could live inside her)..."

Some interpret it as just charlie's jest to bed Camilla. But does it means that it's only restricted to a few days of the menstual cycle ?

Conclusion: Menstual Vampirism