What’s the name of this movie ?

Ok so years and years ago I watched this horror film with my sister. It’s a poorly made film with the quality and acting but that makes it good imo. So there’s this house in these woods, where these really creepy farmers live. These teenagers start camping and going around the woods, where these farmers start killing them off. One scene in particular, the couple is getting frisky and then the farmer stabs the guy with the big saw he has and takes the girl. There’s also a nerdy boy, who wears a bike helmet the entire film. I would really like to know the name as it is REALLY bugging me. Thankyou!