Harper's Island (2009)

There are one or two scenes with bare female backs, but mostly just shoulders or implied nudity. There is a stripper for the bachelor party -- she is not shown stripping much, but talks to one of the characters and is shown in a bra and short skirt. The groomsmen also bring an inflatable sex doll as a joke. Characters are shown bathing, dressing, swimming, and male characters go shirtless for a bit. Some cleavage. Two scenes show a partially dressed couple getting ready for rather unusual sex. Other scenes imply that sex has taken place between two characters. Some kissing, petting.

Dialog contains references to infidelity, "hooking up," "getting some," etc. but no prolonged scenes talking about sex.

A character has their face badly mangled by a boat propeller. Lots of blood

While it aired on broadcast TV, it was pretty violent & gory. Some scenes included beheadings, stabbings, hangings, people being burnt alive, shootings, people being impaled, a character is cut in half at the waist, and another is tied to a yacht propeller and chopped up by it. There were also fight scenes that lead to bloody noses/lips, bruises, and even death. Some of the corpses found are very badly mutilated.