If you could be the best at something but nobody could know, what would it be?
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Sex
If no one knows you're the best, that includes your partners. They'll just walk away thinking you're average.
They'd still have an amazing time, they'd just have no objective way of knowing that the acts that have been performed were world class.
My first thought was giving mind-blowing orgasms and yeah, I'd be okay if my partner just believed that mind-blowing orgasms were just a natural occurrence.