Kylie's Shower Thermometer

I put Kylie in the shower yesterday evening and as she was standing there telling me if the water was still too cold she was all bent over and had her behind stuck out in the spray of water.

Me - Is that good?  Warm enough?
Kylie - Yes, just right.  I can tell because I have a thermometer in my butt.
Me - (trying not to laugh) A thermometer in your butt?
Kylie - When my butt feels the water is warm the rest of me can get in too. (she backs in under the spray)
Me - (leaving the bathroom laughing)