A reasonable person only needs to fall into a toilet bowl once in order to hold a grudge about it.

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I believe one such incident was actually the inspiration for the horror film The Ring.

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To avoid midnight toilet surprises, you want to agree on a default position, and one way to do that is logic. Men need the toilet seat down for pooping, which is, say, 33 percent of their bathroom visits. Women need it down for both, uh, procedures. So for a typical married couple, there's a 66 percent chance (133/200) the toilet seat needs to be down for any given visit. So if you look at you and your partner as a unit, where you both share the house and both of your needs matter, numbers seem to indicate that down is the best default position.

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However, if you, as a man, are looking at your own needs alone, there's a 33 percent chance you'll need it down and a 66 percent chance you'll need it up, so it makes sense to leave it up by default. So deciding to go this way kind of says to the lady (intentionally or not) that she doesn't really factor into your decision. Now if she was asking for something really awful, like for you to spend an hour scrapbooking with her, of course it would be understandable for you to point out that her right to quality time together has to be weighed against your right to not be bored to death, and there has to be some give and take.

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But this isn't about UN-condemned torture methods like couples scrapbooking, this is about flipping a toilet seat. So if you put up a fight about it, you're basically saying that she isn't worth the two seconds it takes to flip a lid up and then down.

Also, come on, the toilet rim is gross.

For more from Christina, check out The 6 Biggest Over-Achievements in the History of Marriage and 7 Things From America That Are Insanely Popular Overseas.