Sea State by Tabitha Lasley

She wanted to see what men are like with no women around. She soon finds out what she is like with no one else around, save for itinerant men who spend half their lives stranded in the middle of the sea. Alone, and contemplating the wreckage of her former life, she dives into a relationship with the first rig worker she meets, a reckless affair that lays them both bare.