Always read the small print.

Jason made a deal with the devil for a new life.

He expected the devil to want his soul as payment so he was slightly confused when the devil told him for payment he would have to become his concubine for one year.

Instead of signing his soul over to him and going straight to hell when he died which to Jason seemed like a good compromise at the time.

so every Monday Wednesday Friday and Sunday Jason unscrewing in a motel would screw him in a motel which he thought was a fair price to pay for his new life.

But Jason should have read the small print before he signed the contract as it was not just a concubine the devil wanted but a willing woman to have his ungodly child which unbeknownst to Jason was already growing inside of him.

So just in a few short months Jason will become the mother of the Devil's offspring and maybe the end of mankind.