I don't think you're understanding what I'm saying Deadly. We don't know each other, so you're definitely not on my car insurance. If it is shown that you drove my car and I say you stole it, then it would be totally on you to prove that I gave you permission. If you couldn't prove that, you'd be convicted of stealing.
However, if I were a man and you said I raped you (god forbid) and there was physical proof sex happened, the chances are I would get away with it because you saying that we don't know each other and I didn't give you permission wouldn't mean anything. Chances are it wouldn't even go to court. But if it did, going on many many past cases, if I said that you liked a certain type of sex and the defence could find someone to corroborate that (no matter how much you deny it) then that would be proof enough that you were lying.