You are trying to use
logic to resolve a problem with a
woman. That is the problem right there. We approach the situation logcially ("there is no reason for the seat to be down"), whereas they approach it esthetically or emotionally ("it looks gross", or "if he loved me he would think about me").
Along the same lines...when your woman picks out a toilet seat cover, does she give any thought to how thick it is? If it's big and fluffy the seat will fall down mid-pee. So you have to hold it up with your knee as you pee. That's a pain in the ass...but you don't hear guys gripe about it. "If you loved me you would pick out a toilet seat cover that isn't so thick! You're not thinking about me!!!".