erm i've never heard of anyone thinking that before :P but theres nothing wrong with thinking that..its just something you assosiate with that phrase. I wouldn't worry about it, our minds can think some seriously strange thoughts some times. Unless its really bothering you, then yuo could talk to a counsillor maybe, or someone you trust.
It appears to Sisophous you have an erotic attraction to corpses known as necrophilia. If you are a guy, you could visit a cemetery, unearth a casket, remove the cadaver and fulfill your desires by penetrating a female. Bear in mind, Sisophous believes in the sanctity of the living as well as the dead so urges you to avoid such a hedonistic and selfish act. Furthermore, it is illegal and will carry a severe penalty if you are caught.