A horror movie with sex on its mind

Remember the horror series Teenage Sex and Death at Camp Miasma ? The original starred Billy Preston, an actress who has vanished from public view. Obligatory sequels followed, establishing the Camp Miasma movies as a horror staple that wore out its welcome. Stop scanning your memory. There never was a Camp Miasma series, but director Jane Schoenbrun bases her movie -- Teenage Sex and Death at…