Just throwin in my two cents here, from my vast collection of knowledge regarding sex.
First put it (your penis silly-willy ) inside the vagina. Then stab her.
Then take it (the penis) outside the vagina.
Repeat until satisfaction has been acheived.
Make it look like an accident.
Eat a sandwich (nothing with mayo! lol! )
) inside the vagina. Then stab her. 
)
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