Nina Forever is a 2015 British horror comedy film written and directed by brothers Ben and Chris Blaine. It stars Fiona O'Shaughnessy, Abigail Hardingham, and Cian Barry. It premiered at the 2015 SXSW film festival. Fiona O'Shaughnessy plays Nina, a revenant who comes back to life to torment her ex-boyfriend and his new girlfriend whenever they have sex.
(Summary from Wikipedia)