Oddly the story of Predator starts with Silvester Stallone. Following the release of Rocky IV, a joke was making rounds in Hollywood that since Rocky Balboa had run out of earthly opponents, he would have to fight an alien if a fifth instalment. Screenwriters Jim and John Thomas wrote the Predator screenplay based on the joke, originally with Stallone in mind for the part. Originally titled Hunter, it featured one commando facing off against the alien, taking inspiration from both Rocky and Rambo. It was picked up by 20th Century Fox in 1985, and turned over Joel Silver and Lawrence Gordon to produce.
Silver and Gordon approached Arnold Schwarzenegger for the lead role. Schwarzenegger liked the combination of action/sci-fi/horror but felt the script would be more believable if it was a team of commandos, so the script was re-written. Jean-Claude Van Damme was originally cast as the alien, however, on the set Van Damme behaved like a whiny little bitch, constantly complaining that the costume was too clumsy and too hot and he was going to pass out. He also repeatedly winged about not be appearing on camera without the suit. Van Damme was removed from the film and replaced by Kevin Peter Hall.
Regardless of how much you liked the movie or not, it is one revelation that will change your whole perspective on the Predator movie and that it: The Predator movie is a gay coming out movie. The alien in the movie represents the characters latent feelings and getting killed by it is a metaphor for coming out of the closet. I'm not even going to get into how all the guns are handled and fired from the hip. The Predator symbolises the spectre of the company of mens suppressed homosexual feelings, which is lurking there unseen, waiting to emerge when they are away from their masculine peers. Arnies character spends the most time with the only woman in the film and consequently is the only one who doesn't get killed by the alien and metaphorically come out of the closet. Covering himself in mud to mask his body heat and hide from the alien he symbolically conceals his true feelings by conforming to match his environment.
Now try watching it again with that idea stuck in your head.