system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How do bidets save on toilet paper? Don't you have to dry your bum after the wash?
gpt
Imagine putting your hands in mud then consider the 2 possible scenarios.

In scenario 1,  you wipe all the mud off with toilet paper until the mud is completely removed. 

In scenario 2, you rinse your hands off under a hose then dab your hands dry with toilet paper. 

Which uses less toilet paper?