What happens if the woman gets attached to you. Do you want to be the cause of her pain?
Even if I made it clear it's NSA?
I would feel guilty and remorse for breaking another person's heart. I can see how even though I say it's going to be "casual" it can morph into something that's not (W and OM).
And to reiterate, I am not looking for a "yeah, go ahead. That makes perfect sense.". I am just looking for some direction now.