Not exactly, I'd let him assist me as much as he wants to satiate his killing needs. Provided that I can make sure the person killing me isnt a fucking psycho who'll follow the plan we previously agreed to and not torture me with shit like ripping my balls with a razor wire, sure why not?
So basically I wouldnt let him have fun with me while im alive, when I die he can rape my body as much as he wants, but he either has to take care or of the body or clean it up so my family isnt traumatized. Actually im not really sure about that last part, he can do 100% as he wishes with my corpse.