GFB wrote:..but...but..but..
And that's exactly what it's about......'cept you need to add an extra "t". You guys have apparently never sat down into cold toilet water in the middle of the night. Nor have you plunked your butt down on a closed toilet lid. Both experiences are highly unpleasant and have the potential for injury............especially to the person who left the seat up. Courtesy is lid up seat down. The exception is in a home with a dog big enough to drink from the toilet. Then it's lid down.......another reason for not having big dogs.
I still think my solution is the best. Separate bathrooms.