My partner joked that we should take a lie-detector test just to see what it's like. It seems like he might have an ulterior motive. I'm wondering if on the surface it's meant to be something silly just to see if we could "beat it" and get away with lies but I think he's fishing. Maybe he doesn't believe my past or the current state of our relationship. What is the line of questioning? If we do it, should we agree on the questions beforehand? My partner is different like that, frequently having off-the-wall ideas so it doesn't surprise me he would come up with something like this. This one just seems weird and he's mentioned it a few times already.
I've heard of some kinky shit in relationships but this one is, well, yeah, off the wall.