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."