I think that's backwards. There's no reason to assume an experience like love can't be replicated by reproducing the same events in the brain. Unless you believe in the supernatural like souls, in which case the conversation is no longer based on scientific analysis.
> BTW, love/affection/contact is one of those aspects of life where you're not a brain in a jar.
This is a non sequitur. The point of the brain in a jar idea is that you have no way to tell that you're a brain in a jar if all the chemicals, electrical impulses, etc are properly manipulated.