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The one I have I run a hot and cold line into it for warm water; then I just sit for a minute or two to air dry. I don't live in a particularly hot or dry region, either.

I wonder if you could get one with warm water. And why not use a towel to dry off afterwards? Many people keep one in the bathroom for showering anyway.

I'm picturing the towel people use to dry there hands suddenly used ALSO to dry butts.

The problem is mainly with 99% of towels being ultra symmetric (up/down, left/right, front/reverse). When your towel is asymmetric, you can split it into zones for various things :)

Japanese washlets use heated water