All Winslow has to do is survive it without going insane. There's more booze to drink than water, and the farting, grating character played by Willem Dafoe will make your most entitled Baby Boomer uncle seem like your best friend. Very quickly, it becomes obvious that this isn't a job for everyone. The movie begins with Robert Pattinson's Winslow joining Willem Dafoe's Thomas on a New England island to watch after a lighthouse. That's not to say a little frustration isn't warranted because Robert Pattinson's character is a guy who is on an isolated island with a dude he hates, doing a job he hates. If the terms 'violent' and 'masturbation' doesn't set up an image already, just imagine how you might look for your lost keys, but sexually, and on 4Chan. Granted, my mental catalogue of masturbation scenes isn't exhaustive, but the aggressive nature alone speaks for itself.
This eventually leads to the most violent masturbation scene I've ever seen. He imagines the mermaid throughout the film, fantasizing about her and what she might look like. Early on in the film, Pattinson's character finds a mermaid figurine in his bed, nestled in a hole about midway down his mattress.