I'm pretty sure leaking a sex video without consent is already illegal in most countries. And you can sue the other party for a lot more severe crimes than copyright damages.
You might be surprised how much the law lags at criminalizing morally reprehensible acts enabled by technology, like revenge porn.
I can't speak to other countries specifics, but in the US the most effective avenue currently appears to be copyright claims. That's a civil proceeding, so the jilted ex is only on the hook for financial penalties.
