Weirdest. Side effect. Ever!

My ass is cold. No, really. To conserve TP I've been bidet-ing for number ones. Yes I know, weird as I don't have a bidet, but I do have a shower hose. As usual I do what I need to do and rinse off and “oh! The water is cold!” I thought I had it warm enough but nope, it felt cold. So I turn up the heat and tried again. Nope, now I'm thinking wtf is going on here? Hotter, nope, still cold. I couldn't get the water to feel warm on only my ass, even though I hadn't had that issue all day. Whaaaaa?! Seriously, how in hell is this a side effect? It's not like I don't do lots of sitting around normally, so that's not it. Weird huh?