What is it?
The 2016 horror film SiREN (Siren).
What is it about?
This is how Metacritic describes this movie:
Jonah is an apprehensive groom-to-be whose bachelor party turns into a nightmare when he frees a seemingly innocent victimized girl locked up in a supernatural sex club. Her ruthless handler and proprietor of the sex club will stop at nothing to re-capture his prize. Jonah struggles to rescue the girl only to discover it is he who needs to be rescued as he comes to the realization that she is a dangerous fabled predator who has chosen him as her mate.
My brother GC and I watched this film last night, and it was a bit better than expected but we did not like how not much was explained about various things and some of the nudity and sex and the ending scene.
Here is a review of this film by GoodBadFlicks: