While having sex when your girlfriend is on her period, let your dick get blood on it. Then you pull out and let it dry, allowing the "rust" to form. Then bend her over, get a good 10
ft. running start, and straight up
truck her
ass.
The Rusty Truck:
Male usage: "Betty's been bitching all week, and I got so annoyed, I pulled out the big guns and Rusty Trucked that
bitch."
Female usage: "I met this guy last night at an S&M convention. He was really cool. I was on my period and I still have bruises on my
ass from all those Rusty Trucks."