A mother, her two grown up kids, and a female friend arrive at a woodland cabin and proceed to explore their new surroundings. Unfortunately for them, a homicidal sex maniac is also roaming the woods looking for hapless victims to humiliate, abuse and butcher.
As a rule, I don't watch adult films unless they offer me something other than endless humping. Wet Wilderness is a typically mean-spirited '70s roughie—just under an hour of hardcore depravity that proves tedious in the extreme—but it piqued my interest thanks to its proto-slasher antagonist, who dons a ski mask (possibly inspired by the killer in Sergio Martino's 1973 giallo Torso) and wields a machete years before Jason Vorhees would make it his weapon of choice.
Wet Wilderness's horror element definitely takes a back seat to the repetitive sex (which goes all out to offend with lots of forced incest), but horror fans who hang in there will be treated to at least a couple of gory death scenes, including a machete to the groin and an axe in the chest (the blood spraying over the two naked women nearby). Sadly, my copy of the film seemed to be missing at least one more killing (that of the brother) and ended abruptly just as the killer was about to get his comeuppance.