How to turn on a guy?

There's a guy and we're really close. We talk everyday and make sexual jokes with each other. The other day he told me doesn't want to have sex with anyone until marriage. How can I get him to... change his mind. Boobs and butt aren't really an option since I don't really have curves :( I don't want to seem really desperate and thirsty, so how can I turn him on a very subtle, jokey kind of way? (Either through text or in person)
How to turn on a guy?
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