Lace Crater (movie, 2015)

Opting to sleep in the allegedly-haunted guest house while spending a weekend in the Hamptons with friends, Ruth, a lonely young woman in her mid-twenties who's had too much to drink, strikes up a conversation that leads to a sexual encounter with Michael, a burlap-draped ghost that casually appears before her. Through this inter-paranormal relation, Ruth contracts an STD with alarming effects.