Madman (1982)

The 1982 slasher classic Madman tells the story of a group of camp counselors who unwittingly summon the demonic axe murderer Madman Marz (Paul Ehlers) while telling a campfire story. As the madman begins to stalk and kill his young victims, one counselor (Gaylen Ross) loses her virginity to her boyfriend in a jacuzzi. If you can avoid looking at her man's ass, you'll get a great look at Gaylen's hot tub hoots before she gets axed the mad man. And that ain't bad, man.