The thing is, this was technically required in the US under USC 2257 for the past two decades: https://www.law.cornell.edu/uscode/text/18/2257

Although I think that says "produces" rather than "publishes" or "distributes", so pornhub themselves aren't liable but the boyfriend "producing" the film has committed an offence. Not that there's any will to enforce this.

Closer to home, Scotland explicitly banned revenge porn, and has actually achieved some prosecutions.