Insatiable Pursuers (1988)

Original title: Perseguidores Insaciáveis

A group of young misfits decide to go camping in a remote forest region. On the way, they stop to destroy a gas station and are attacked by a commando of psychopathic mercenaries. A massacre ensues, in which one of the sons of the commando's leader is killed. Furious, he and his henchmen start chasing the young survivors, who desperately try to hide in the forest, while having a lot of sex along the way.