I'm talking about that universal fact of life faced by cold climate dwellers: sitting on a cold toilet seat (C. T. S.) in the dead of night. At least guys have only the number #2 occasions to worry about. We ladies get it both ways! It ain't fair, y'know.
Why a C. T. S.? It all comes down to thermodynamics: the transfer of cold from a colder object to one that is warmer. Entropy, my Dear Watson. Some materials transfer this type of cold more effectively than others. Basically, there are three kinds of toilet seats: vinyl plastic ones, wooden ones, and padded ones. The vinyl ones transfer heat more effectively to its colder surface than the wooden ones. The padded ones transfer the least amount of heat.
Therefore, your warmer surface (your behind) loses the least amount of heat on a padded one; while if it's on a plastic one, it loses its heat most efficiently.
An awkward, self-serving solution is to stay in bed until your husband or lover goes first; then get up while the seat is sort of warmish. And encourage him to have a seated #1.
But the best solution is to go with a soft padded one. It has the advantage in that it is also more comfortable. This is a boon especially for people who have a magazine rack in the bathroom! For the changes of the season, a fussy person might replace the padded one with a wooden or plastic one for the later spring, summer, and some of the fall.
Here's also another tip: If you have a plastic horseshoe-type (open front) toilet seat, and want to pad it, try this tip from Buzzfeed:
You may have to knit a cover for your doughnut-type (closed front) toilet seat; and that would be a killer conversation piece if you do your knitting while flying or during a meeting! Who knows, there may be how-to-do-it instructions somewhere!