I can't say I agree with the, um, toilet "proof", but I have to say that most of the other reasons listed sound more like infatuation to me than love.

Leslie's answer was a beautiful. I think she really summed it up well. I love my husband dearly and passionately, but I don't think about him a million times a day anymore, and when we're mad, I don't think about how cute he is. But I would lay my life on the line for him and what makes me want to is that I know that he would do the same for me.